| 单词 | alkyl |
| 例句 | The second major group of insecticides, the alkyl or organic phosphates, are among the most poisonous chemicals in the world. Silent Spring 1962-09-27T00:00:00Z Name and write the structures of all isomers of the propyl and butyl alkyl groups. Chemistry 2019-02-14T00:00:00Z “Poppers” is slang for the alkyl nitrites class of drugs. Bette Midler renews allegation Geraldo Rivera groped her 2017-11-30T05:00:00Z There were 11 deaths in England and Wales between 1993 and 2013 where the death certificate only mentioned an alkyl nitrate, according to the Advisory Council for the Misuse of Drugs. Ministers decide not to ban 'poppers' - BBC News 2016-03-23T04:00:00Z These poppers are based on alkyl nitrites and are related to the medication amyl nitrite. New Form of Club Drug 'Poppers' May Pose Risks for Gay Men 2015-01-16T05:00:00Z Question 3: Which alcohol will most easily react with HCl to form an alkyl halide? 3 Challenging Sample MCAT Questions on Organic Chemistry 2014-09-23T04:00:00Z The name of an alkyl group is obtained by dropping the suffix -ane of the alkane name and adding -yl: Chemistry 2019-02-14T00:00:00Z ETHYL, in chemistry, the name given to the alkyl radical C2H5. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 8 "Ethiopia" to "Evangelical Association" 2011-03-05T03:00:24.537Z ETHERS, in organic chemistry, compounds of the general formula R�O�R′, where R, R′ = alkyl or aryl groups. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z Poppers are small vials of a type of chemical called alkyl nitrates that are crushed or "popped" to release the fumes. "Poppers" may cause lasting vision loss 2011-02-22T22:32:04Z D. All alcohols react equally to form alkyl halides, incorrect. 3 Challenging Sample MCAT Questions on Organic Chemistry 2014-09-23T04:00:00Z The open bonds in the methyl and ethyl groups indicate that these alkyl groups are bonded to another atom. Chemistry 2019-02-14T00:00:00Z Similarly, the acid H atom of either an organic or an inorganic acid may be replaced by the alkyl group of an alcohol, producing "ethereal salts," or "esters." The Chemistry of Plant Life They may be prepared by the action of concentrated sulphuric acid on the alcohols, alkyl sulphuric acids being first formed, which yield ethers on heating with alcohols. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The sale of alkyl nitrates is legal; they're easily available both online and in stores that sell drug paraphernalia. "Poppers" may cause lasting vision loss 2011-02-22T22:32:04Z One of the most important is the Friedel and Craft’s reaction, in which an aromatic compound combines with an alkyl haloid in the presence of aluminium, zinc or ferric chloride. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" Note that alkyl groups do not exist as stable independent entities. Chemistry 2019-02-14T00:00:00Z The second type are the "unsaturated" acids belonging to several different groups, as discussed below, but all having one or more double-linkages between the carbon atoms of the alkyl radical which they contain. The Chemistry of Plant Life They may also be prepared by heating the alkyl halides with silver oxide. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The hydrogen of the hydroxyl group in phenol can be replaced by metals, by alkyl groups and by acid radicals. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" We proceed to consider various simple derivatives of the alcohols, which we may here regard as hydroxy hydrocarbons, R�OH, where R is an alkyl radical, either aliphatic or cyclic in nature. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Write the structures for all the isomers of the –C5H11 alkyl group. Chemistry 2019-02-14T00:00:00Z All the salts are explosive and readily interact with the alkyl iodides. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" In such a case the ester is best prepared by the action of an alkyl halide on the silver salt of the acid, and when once prepared, can only be hydrolysed with great difficulty. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The normal esters may be prepared by the action of silver carbonate on the alkyl iodides, or by the action of alcohols on the chlorcarbonic esters. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" In fact, the analogy between the alkyl groups and metallic elements forms a convenient basis from which to consider many derivatives. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The location of an alkyl group on a hydrocarbon chain is indicated in the same way as any other substituent: Chemistry 2019-02-14T00:00:00Z On a hunch I dropped in an aluminum alkyl, and then pushed the polymerization along with both ultraviolet and heat. The Professional Approach If, for example, a substance contains alkyl or hydroxyl groups, large quantities of the para compound are obtained, and very little of the ortho. Nitro-Explosives: A Practical Treatise The potassium salt reacts with the alkyl iodides to give N-substituted alkyl derivatives. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The hydrogen in the hydroxyl group, as is known, may be substituted by an alkyl group. Scientific American Supplement No. 822, October 3, 1891 As shown in the following compound, the red symbols represent the smaller alkyl group and the oxygen atom, which would be named “methoxy.” Chemistry 2019-02-14T00:00:00Z Tertiary alcohols are thus seen to be characterized by the group :C.OH, in which the residual valencies of the carbon atom are attached to alkyl groups. The Project Gutenberg Encyclopedia Volume 1 of 28 This diversity of possible alkyl groups can be identified in the following way: The four hydrogen atoms in a methane molecule are equivalent; they all have the same environment. Chemistry 2019-02-14T00:00:00Z The alkyl derivatives may be obtained by heating phenol with one molecular proportion of a caustic alkali and of an alkyl iodide. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" For instance, an alkyl may be substituted for the hydroxyl hydrogen in an alcohol molecule, when an ether results. Scientific American Supplement No. 822, October 3, 1891 We call a substituent that contains one less hydrogen than the corresponding alkane an alkyl group. Chemistry 2019-02-14T00:00:00Z The alcohol is first acted upon with phosphorus and iodine, and the resulting alkyl iodide is treated with silver nitrite, which gives the corresponding nitro-alkyl. The Project Gutenberg Encyclopedia Volume 1 of 28 Two different alkyl groups can be formed from each of these molecules, depending on which hydrogen atom is removed. Chemistry 2019-02-14T00:00:00Z The names and structures of these and several other alkyl groups are listed in Figure 20.5. Chemistry 2019-02-14T00:00:00Z If, however, a second molecule of a zinc alkyl be allowed to react, a compound is formed which gives a tertiary alcohol when decomposed with water. The Project Gutenberg Encyclopedia Volume 1 of 28 Some hydrocarbons can form more than one type of alkyl group when the hydrogen atoms that would be removed have different “environments” in the molecule. Chemistry 2019-02-14T00:00:00Z |
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