| 单词 | aldehyde |
| 例句 | Even through the door she can smell him, peppermint, musk, aldehyde. All the Light We Cannot See 2014-05-06T00:00:00Z Oxidation leads to the formation of smaller molecules such as ketones, aldehydes and fatty acids that give rancid foods a characteristic rank, strong and metallic scent. Rancid food smells and tastes gross — AI tools may help scientists prevent that spoilage 2023-10-19T04:00:00Z You might be trying to get at, for example, an aldehyde called vanillin. In a high-tech world, aged spirits still get much of their flavor from wood and fire 2019-02-21T05:00:00Z After a match, “he stank like kerosene, ammonia, aldehyde, sweat. His waterlogged clothes looked like he’d been dunked in the ocean. Foreign hairs from the mat were sticking to his skin.” Atticus Lish’s Second Novel Is a Brooding Heartbreaker 2021-08-23T04:00:00Z Cats' scent comes from a mix of volatile organic compounds, including aldehydes, alcohols, esters and ketones. More than meows: How bacteria help cats communicate 2023-11-16T05:00:00Z These aldehydes can cause lung disease and heart disease. California banned the sales of flavored tobacco products, but researchers say online sales have boomed 2023-11-08T05:00:00Z In an aldehyde, the carbonyl group is bonded to at least one hydrogen atom. Chemistry 2019-02-14T00:00:00Z That's because wood smoke is generally composed of smaller particles that can worm their way into human cells, and it contains things like "polycyclic aromatic hydrocarbons" and "aldehydes," which trigger inflammation and damaging oxidation. Wildfire smoke claims more than 33,000 lives each year, new study finds 2021-09-14T04:00:00Z It’s worth noting that when crushed — as when making pesto — enzymes in cilantro gradually transform the aldehydes so the herb no longer smells and tastes soapy. Breaking down our collective love-hate relationship with cilantro 2021-04-26T04:00:00Z Line-drying uniquely produced a number of aldehydes and ketones: organic molecules our noses might recognize from plants and perfumes. How Line-Dried Laundry Gets That Fresh Smell 2020-05-29T04:00:00Z All three are aldehydes, which are responsible for lots of odors. Male lemurs may spread fruity ‘love potions’ with their tails 2020-04-16T04:00:00Z The importance of molecular structure in the reactivity of organic compounds is illustrated by the reactions that produce aldehydes and ketones. Chemistry 2019-02-14T00:00:00Z One aldehyde relevant to human health is acetaldehyde, which is produced when cells process ingested alcohol. A safe fix for alcohol-derived DNA damage 2020-03-03T05:00:00Z That’s because most of the cilantro taste and aroma is formed from natural compounds in the leaves called aldehydes, which are also produced during the making of soap. Breaking down our collective love-hate relationship with cilantro 2021-04-26T04:00:00Z Those radicals then recombine with other nearby molecules, processes that often lead to the creation of aldehydes as well as ketones. How Line-Dried Laundry Gets That Fresh Smell 2020-05-29T04:00:00Z One biologist at the Monell Chemical Research Center found that an increased concentration of an unsaturated aldehyde produced, in the old, “a distinctive grassy, waxy or fatty odor”. Cruel jokes about the old are everywhere. When will we face our ageism epidemic? | Francine Prose 2019-11-10T05:00:00Z Formaldehyde, an aldehyde with the formula HCHO, is a colorless gas with a pungent and irritating odor. Chemistry 2019-02-14T00:00:00Z “It’s possible you find these aldehydes more in Japanese populations than in Americans,” he said. Do Older People Have a Different Smell? 2019-08-08T04:00:00Z Acetals are formed from alcohol and aldehydes, and are used to flavor foods and other commercial products. FDA seeks public input on 19 chemicals found in e-cigarettes 2019-08-05T04:00:00Z These organic compounds, called aldehydes, are found in citrus fruit rinds, as well as in off-the-shelf perfumes, including Chanel No. 5. These Birds Make Their Own Citrus-Scented Cologne 2018-05-25T04:00:00Z It’s possible higher aldehyde levels come directly from the parasite or when fat in the person’s cells breaks down during an infection, according to the study. Malaria infection creates a ‘human perfume’ that makes us more attractive to mosquitoes 2018-04-16T04:00:00Z We prepare carboxylic acids by the oxidation of aldehydes or alcohols whose –OH functional group is located on the carbon atom at the end of the chain of carbon atoms in the alcohol: Chemistry 2019-02-14T00:00:00Z E-cigarettes are theoretically safer than cigarettes because they don’t burn tobacco, which produces a noxious mixture of toxic and cancer-causing substances, such as polycyclic aromatic hydrocarbons, aldehydes, and heavy metals like cadmium and arsenic. Vaping companies are using the same old tricks as Big Tobacco 2017-11-16T05:00:00Z “It’s very much Parisian chic — a classic floral aldehyde revisited,” said Malle, who collaborated with Belgian designer Dries Van Noten and footwear designer Pierre Hardy on other projects. Frédéric Malle puts the finishing touches on a new perfume launch and Melrose Place store 2017-03-24T04:00:00Z In one case study, our initial synthesis of an aldehyde intermediate used a flammable solvent in the presence of oxygen. Industrial research: Drug companies must adopt green chemistry 2016-05-30T04:00:00Z Option No. 5 had floral notes, but Beaux included an experimental chemical called aldehyde, which extended the aroma of a perfume. New book captures pop culture moments that scream love 2016-01-13T05:00:00Z How does hybridization of the substituted carbon atom change when an alcohol is converted into an aldehyde? Chemistry 2019-02-14T00:00:00Z The 2015 paper described two flavors, a dark chocolate and a wild cherry, that would expose vapers to more than twice the recommended workplace safety limit for the aldehydes vanillin and benzaldehyde. What’s in all that e-cig vapor? 2015-08-31T04:00:00Z They undergo what's called oxidation - they react with oxygen in the air to form aldehydes and lipid peroxides. Which oils are best to cook with? - BBC News 2015-07-27T04:00:00Z The two that are most prevalent in watermelons are C6 and C9 aldehydes, which are typically described as being “green” smells. On the chemistry -- and inimitable summer aroma -- of watermelon 2015-06-10T04:00:00Z The finding that raises questions about health effects, however, is that six of the 24 compounds used to flavor the liquids are part of a class of chemicals called aldehydes, known to be respiratory irritants. E-Cigarette Flavoring Chemicals May Pose Risks When Inhaled 2015-04-16T04:00:00Z The names for aldehyde and ketone compounds are derived using similar nomenclature rules as for alkanes and alcohols, and include the class-identifying suffixes -al and -one, respectively: Chemistry 2019-02-14T00:00:00Z Kohji Mitsubayashi, at the Tokyo Medical and Dental University, and colleagues impregnated a mesh with the enzyme alcohol oxidase, which converts low molecular weight alcohols and oxygen into aldehydes and hydrogen peroxide. Wine Snobs Are Right: Glass Shape Does Affect Flavor 2015-04-14T04:00:00Z The olive oil and cold-pressed rapeseed oil produced far less aldehydes, as did the butter and goose fat. Which oils are best to cook with? - BBC News 2015-07-27T04:00:00Z When people consume alcohol, the body breaks it down into several by-products, including chemicals called aldehydes. Asian Glow May Indicate Lower Pain Tolerance 2015-02-08T05:00:00Z Head notes of geranium and aldehydes transform into a floral heart of chamomile, violet and bruised rose petals. The 10 Best Rose Fragrances to Gift for Valentine's Day 2015-02-06T05:00:00Z In both aldehydes and ketones, the geometry around the carbon atom in the carbonyl group is trigonal planar; the carbon atom exhibits sp2 hybridization. Chemistry 2019-02-14T00:00:00Z The researchers made their ionic liquids using furfural, vanillin and p-anisaldehyde, which are aromatic aldehydes derived from lignin and cellulose. Recycled Biofuel Byproducts Could Make Biofuels Even Greener 2014-08-27T04:00:00Z "We found," he says, "that the oils which were rich in polyunsaturates - the corn oil and sunflower oil - generated very high levels of aldehydes." Which oils are best to cook with? - BBC News 2015-07-27T04:00:00Z The discovery suggests that natural aldehydes produced by the body contribute significantly to pain and that they are kept in check by ALDH2. Asian Glow May Indicate Lower Pain Tolerance 2015-02-08T05:00:00Z The identity of the aldehyde products was confirmed by GC–MS in comparison to authentic standards. High-level semi-synthetic production of the potent antimalarial artemisinin 2013-04-26T14:21:10.803Z An alcohol with its –OH group bonded to a carbon atom that is bonded to no or one other carbon atom will form an aldehyde. Chemistry 2019-02-14T00:00:00Z Those off-flavors are the result of breaking down secondary products like amino acids and the ethanol which might result in some fouler or vinegary compounds, such as esters and aldehydes. The Making of a Brewmaster, 200 MYA 2012-08-20T20:45:07.483Z According to food chemistry expert Harold McGee, there are around six substances that contribute to the telltale aroma of cilantro, mostly fat molecules known as aldehydes. Taster's Choice: Why I Hate Raw Tomatoes and You Don't 2012-05-29T15:15:00.207Z Of or pertaining to aldehyde; as, aldehydic acid. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z A white crystalline substance, C14H12O2, obtained from benzoic aldehyde and some other sources. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Formalin, for′ma-lin, n. a formic aldehyde used as an antiseptic, germicide, or preservative in foods. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) 2012-01-11T03:00:23.770Z By the action of dehydrating agents they are converted into aldehydes or ketones. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z And yes, similar aldehydes can also be found in soaps and lotions — and bugs, which make use of aldehyde-drenched body fluids as either an attractant or a repellant. Taster's Choice: Why I Hate Raw Tomatoes and You Don't 2012-05-29T15:15:00.207Z In organic chemistry, his study of the ketones and aldehydes, begun in 1857, provided him with the subject of his other doctoral thesis. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 2 "French Literature" to "Frost, William" 2011-10-14T02:00:26.280Z This solution is frequently used as a test reagent for the detection of aldehydes, giving, in most cases, a red coloration on the addition of a small quantity of the aldehyde. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z "And some would say that if it weren't for alcohol no one would need a contraceptive anyway," jokes Amory, who is working on ways to more specifically inhibit aldehyde dehydrogenase 1a2. Beyond Condoms: The Long Quest for a Better Male Contraceptive 2011-06-14T11:15:00.307Z The interesting thing about aldehydes is that one of them smells like soap. Lasting allure 2011-05-29T04:26:27Z The calcium salt, when heated with the calcium salts of higher homologues, gives aldehydes. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Of such condensation products undoubtedly the most important are the hydrazones, which result from the interaction with aldehydes and ketones. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z A. B�champ and E. Duclaux found that acetic acid is formed in small quantities during fermentation; aldehyde has also been detected. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 "Fenton, Edward" to "Finistere" 2011-03-14T03:01:00.580Z The same or similar aldehydes are also found in soaps and lotions and the bug family of insects. The Curious Cook: Why Cilantro Tastes Like Soap, for Some 2010-04-13T23:33:00Z The first synthetic reaction is the formation of a molecule of formic aldehyde, CH2O, by the combination of a molecule of water with an atom of carbon. The Mechanism of Life It is not possible to obtain the aldehyde in a pure condition, since it readily polymerizes. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z The aldehydes and ketones provided material for his earlier work. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z The characteristic flavour and odour of wines and spirits is dependent on the proportion of higher alcohols, aldehydes and esters which may be produced. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 "Fenton, Edward" to "Finistere" 2011-03-14T03:01:00.580Z If the urine is acid, bicarbonate of soda may be given, or citrate of soda; if alkaline, urotropine—a derivative of formic aldehyde—may prove a useful urinary disinfectant. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" From this formic aldehyde, or formol, we may obtain all the various carbohydrates by simple polymerization, i.e. by the association of several molecules, with or without elimination of water. The Mechanism of Life However, the ordinary aldehyde reactions of the sugars are more clearly indicated by the open-chain formula. The Chemistry of Plant Life He maintains that it occurs in several well-defined stages during which oxygen enters into and is incorporated with the hydrocarbon molecule, forming oxygenated intermediate products among which are alcohols and aldehydes. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z Malachite green discovered; leading to manufacture of benzoic aldehyde. Coal and What We Get from It They yield from 3 to 6% of a volatile oil, the chief constituent of which is cymene aldehyde. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" Among the first class, aerial or gaseous disinfectants, formic aldehyde has of late years taken foremost place. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" This is because of the aldehyde group which they contain. The Chemistry of Plant Life It consists essentially of cinnamic aldehyde, and by the absorption of oxygen as it becomes old it darkens in colour and develops resinous compounds. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" A mixture of vanillin and benzoic aldehyde when attenuated to a state of extreme dilution in a spirituous solvent, gives the perfume known as “heliotrope.” Coal and What We Get from It An ammoniacal solution of silver nitrate is reduced by chloral; and nascent hydrogen converts it into aldehyde. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" Disinfection by sulphurous acid fumes is of great antiquity, and is still in very general use; for the purpose of destroying vermin it is more powerful than formic aldehyde. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" All sugars which have active aldehyde groups in the molecule form osazones. The Chemistry of Plant Life The thermal effect of the aldehyde group has the average value 64.88 calories, i.e. considerably greater than the alcohol group. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" By this means the first compound is transformed into benzoic aldehyde, and the second into benzoic acid. Coal and What We Get from It It has been suggested that urea is formed by polymerization of ammonium carbonate, and formic aldehyde is synthesized from CO2 and OH2. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" He studied the formation of aldehyde from 351 alcohol by various methods, also obtaining its crystalline compound with ammonia, and he was the discoverer of furfurol. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" When an osazone is decomposed by boiling with strong acids, the phenyl hydrazine groups break off, leaving a compound containing both an aldehyde and a ketone group. The Chemistry of Plant Life The average value for the carboxyl group is 119.75 calories, i.e. it is equal to the sum of the thermal effects of the aldehyde and carbonyl groups. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Benzoic acid, like the aldehyde, is a natural product which has long been known. Coal and What We Get from It The process is stopped when the specific gravity of the product reaches 0.832 at 60° F. The specific gravity of pure aldehyde is 0.79 nearly. On Laboratory Arts The glycogen product deposited a very small amount of crystalline matter on standing, but the quantity was too minute for examination; moreover, it refused altogether to crystallise in contact with the aldehyde. Researches on Cellulose 1895-1900 It is composed of two molecules of glucose linked together through the aldehyde group of each, as trehalose is a non-reducing sugar. The Chemistry of Plant Life By the action of hydroxylamine or phenylhydrazine on aldehydes or ketones, condensation occurs between the carbonyl oxygen of the aldehyde or ketone and the amino group of the hydroxylamine or hydrazine. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" In one operation, therefore, setting out from toluene, we make these two natural products, the aldehyde and acid, which are easily separable by technical processes. Coal and What We Get from It The value of the oil depends upon its aldehyde content, the chief constituent being cinnamic aldehyde. The Handbook of Soap Manufacture The aldehyde gives yellow or colourless solutions in various solvents, which are turned purple by a sufficient excess of hydrogen bromide. Researches on Cellulose 1895-1900 The different organic constituents of glucosides are of a great variety of types, such as phenols, alcohols, aldehydes, acids, oxyflavone derivatives, mustard oils, etc. The Chemistry of Plant Life A study of the separate compounds which impart flavor to fruits, as the various aldehydes, ethers, and organic salts, belongs to organic chemistry rather than to foods. Human Foods and Their Nutritive Value The process depending on the use of nitrobenzoic aldehyde is much simpler; but the particular nitro-derivative of the aldehyde which is required is at present difficult to make, and therefore expensive. Coal and What We Get from It Besides methyl salicylate, the oil contains triaconitane, an aldehyde or ketone, and an alcohol. The Handbook of Soap Manufacture Investigation of the products for yield of furfural, gave 9 p.ct. of this aldehyde showing the presence of celluloses, other than the normal type. Researches on Cellulose 1895-1900 Finally, it may be assumed that easily oxidizable substances, such as aldehydes and acids, are possibly protected against too rapid, or premature, oxidation by being transformed into glucosides. The Chemistry of Plant Life The most important of these classes are the hydrocarbons, the alcohols, the aldehydes, the acids, the ethereal salts, the ethers, the ketones, the organic bases, and the carbohydrates. An Elementary Study of Chemistry With dilute sulphuric acid and bichromate of potassium turns green, and evolves aldehyde. Aids to Forensic Medicine and Toxicology In the case of lemon oil, where the proportion of aldehydes, though of great importance, is relatively very small, it is necessary to first concentrate the aldehydes before determining them. The Handbook of Soap Manufacture But this interpretation ignores a number of other probable sources of the aldehyde. Researches on Cellulose 1895-1900 The oxygenated essential oils may be either alcohols, aldehydes, ketones, acids, esters, or phenols, derived from either five-membered or six-membered closed-ring hydrocarbons. The Chemistry of Plant Life The author has now proved that under the same conditions by which ordinary alcohol affords aldehyde, styrone affords the aldehyde of cinnamic acid, that is, oil of cinnamon. The Art of Perfumery And Methods of Obtaining the Odors of Plants Heated with lime, very distinct odors of benzoic aldehyde are developed. Scientific American Supplement, No. 620, November 19,1887 The flask is then filled with the sodium sulphite solution, the volume of the cooled unabsorbed oil read off, and the percentage of aldehydes calculated as before. The Handbook of Soap Manufacture The total furfural is rapidly formed, whereas the volatile acid continues to be formed long after the aldehyde ceases to come over. Researches on Cellulose 1895-1900 Any sugar which contains a potentially active aldehyde group will exhibit this reducing effect and is known as a "reducing sugar." The Chemistry of Plant Life By the addition of diluted sulphuric acid, the aldehyde of cinnamic acid is afterwards procured pure. The Art of Perfumery And Methods of Obtaining the Odors of Plants During the reaction, large quantities of volatile oxidation products of alcohol, such as aldehyde, ethylic nitrate, &c., are evolved from the boiling liquid, whilst others, such as glycollic acid, remain in solution. Nitro-Explosives: A Practical Treatise This aldehyde is a body that can be polymerized, that is to say, is capable of combining with itself a certain number of times to form complexer bodies, especially glucose. Scientific American Supplement No. 822, October 3, 1891 Piperonal, an aldehyde closely allied to vanillin, is used in perfumery under the name of heliotropin and is prepared from oil of sassafras and oil of camphor. Studies in the Psychology of Sex, Volume 4 Sexual Selection In Man In some of the di- and tri-saccharides, the linkage of the hexose components together is through the aldehyde group, in such a way that it loses its reducing effect; such sugars are known as "non-reducing." The Chemistry of Plant Life In the presence of emulsin, amygdalin is decomposed into glucose, hydrocyanic acid and benzoic aldehyde, and reformed from them. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 Field groups the solvents of pyroxyline into classes thus: Two of the monohydric alcohols; compound ethers of the fatty acids with monohydric alcohols, aldehydes; simple and mixed ketones of the fatty acid series. Nitro-Explosives: A Practical Treatise It is obtained by the distillation of alcohol with nitric and sulphuric acids, and consists essentially of ethyl nitrite with a little acetic aldehyde. The Gutenberg Webster's Unabridged Dictionary Section S It is the second member of the paraffin series, and its most important derivatives are common alcohol, aldehyde, ether, and acetic acid. The Gutenberg Webster's Unabridged Dictionary Section D and E When glycerol is heated with dehydrating agents, it is easily converted into acrolein, an unsaturated aldehyde having a peculiar characteristic pungent odor. The Chemistry of Plant Life Thus primary alcohols and aldehydes, both of the aliphatic and aromatic series, readily yield on oxidation acids containing the same number of carbon atoms. The Project Gutenberg Encyclopedia Volume 1 of 28 At the same time, a more pronounced odor of fatty acids and aldehydes is apparent. Scientific American Supplement, No. 447, July 26, 1884 Moreover, the closest analysis fails to detect in the circulation any trace of the products of alcoholic combustion, such as aldehyde and acetic acid. Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics Further, 100 parts of aldehyde hydrated butyric acid and acetic ether contain the same elements in the same proportion. Familiar Letters on Chemistry The first fraction of the distillate contains benzyl alcohol together with unchanged aldehyde, as well as a small quantity of water. Organic Syntheses Secondary alcohols result from the reduction of ketones; and from the reaction of zinc alkyls on aldehydes or formic acid esters. The Project Gutenberg Encyclopedia Volume 1 of 28 Hop-bitter acid appears to possess the character of an aldehyde and of a weak acid; for the present I am not in a position to state its constitution more clearly. Scientific American Supplement, No. 447, July 26, 1884 It denotes the formation of aldehyde—a substance produced in the slow oxidation of alcohol. Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics The aldehyde prepared in this way is in the form of small granular crystals, which vary in different runs from a flesh color to a lemon yellow. Organic Syntheses The benzyl alcohol used in this preparation must be free from impurities, especially aldehyde. Organic Syntheses At the beginning, the aldehyde comes down slightly colored. Organic Syntheses The rest of the aldehyde is now precipitated by means of more sodium hydroxide solution, and comes down almost white. Organic Syntheses At the very end of the neutralization, particularly if the original product was quite yellow, the last 4 to 5 g. of aldehyde should be precipitated separately, as they are inclined to be slightly colored. Organic Syntheses Notes The aldehyde that is obtained without reprecipitation gradually takes on a pinkish tinge on exposure to light. Organic Syntheses The slightly moist aldehyde is distilled under diminished pressure from an oil bath, by means of a 1-l. Organic Syntheses Thorough washing of the crude aldehyde is particularly desirable, as it removes a reddish impurity which tends to distil over and color the product lemon yellow or sometimes even brownish yellow. Organic Syntheses In the reprecipitation of a deeply colored product, the portion of aldehyde at the end may be even purplish in color and particular care must be taken to keep this separate. Organic Syntheses Vigorous mechanical stirring must be employed during the precipitation of the crude aldehyde, as otherwise large lumps are formed which make washing difficult. Organic Syntheses If the aldehyde is dried before distilling, it is possible to use a 500-cc. distilling flask instead of a 1-l one. Organic Syntheses The aldehyde separates, and is filtered with suction. Organic Syntheses In purifying the aldehyde, sodium carbonate may be used in place of sodium hydroxide for precipitation, but it causes much foaming. Organic Syntheses |
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