| 单词 | benzyl |
| 例句 | The substance is injected deeply into the muscle and typically consists of oil, benzyl alcohol, and lidocaine, according to a 2009 review on the usage of Synthol in bodybuilding. Russian 'Popeye' has 3 pounds of 'dead' muscle removed after DIY bodybuilding injections 2019-11-20T05:00:00Z Testing revealed an elevated presence of benzyl chloride in a lab, she said. 2 Arkansas Chemistry Professors Face Charges of Making Meth 2019-11-17T05:00:00Z A benzyl ring might rotate, or organic-chain links flex and stretch. Experimentalists and theorists need to talk Conversely, the review found treatment with several topical prescription products were safe and effective with just one application; those include using ivermectin, malathion and spinosad, while benzyl alcohol required two applications. What’s the Best Treatment for Super Lice? 2016-09-13T04:00:00Z A third prescription option is Ulfesia, which has been available since 2009 and is made with benzyl alcohol that suffocates the lice but doesn't harm the eggs. Scratching your head over lice? You're not alone, but experts say don't panic 2015-10-16T04:00:00Z Two genes, for example, give rise to bacterial enzymes that help break down the toxic chemical benzyl cyanide. Bdelloids Surviving on Borrowed DNA 2012-11-15T22:40:04Z Adult hawkmoths are deft and effective pollinators, and the plants woo them with flowers that open at night and produce a scent rich in benzyl acetone, a hawkmoth favorite. Tobacco Tricks Caterpillars With Treats 2011-02-24T15:25:00Z A relatively new prescription product called Ulesfia is a benzyl alcohol formulation that smothers the bugs. Using Listerine to treat lice 2010-09-29T21:21:00Z Boos adds that the prescription Ulesfia – for which the active ingredient is benzyl alcohol – is also a good option to effectively kill lice in young kids, since it's approved for children 6 months and older. What’s the Best Treatment for Super Lice? 2016-09-13T04:00:00Z Blue shade of methyl violet introduced; leading to manufacture of benzyl chloride. Coal and What We Get from It Benzyl Acetate, the ester obtained from benzyl alcohol and acetic acid. The Handbook of Soap Manufacture The first fraction of the distillate contains benzyl alcohol together with unchanged aldehyde, as well as a small quantity of water. Organic Syntheses The recovered benzyl alcohol can be used for the preparation of a second lot of benzyl benzoate only after it has been boiled with strong sodium hydroxide to remove all traces of benzaldehyde. Organic Syntheses The materials are cheap, the experimental procedure simple, and the product obtained is free from objectionable traces of benzyl chloride. Organic Syntheses It is well to wash the filtered salt with a small portion of alcohol in order to remove any benzyl cyanide which may have been mechanically held. Organic Syntheses The residual liquid is cooled, filtered if necessary, and the layer of benzyl cyanide separated. Organic Syntheses The temperature then rises rapidly to the boiling-point of benzyl benzoate, when the receivers are changed. Organic Syntheses This crude benzyl cyanide is now placed in a Claisen distilling flask and distilled in vacuo, the water and alcohol coming over first, and finally the cyanide. Organic Syntheses Notes The quality of the benzyl chloride markedly affects the yield of pure benzyl cyanide. Organic Syntheses One method of purifying the benzyl cyanide is to steam distil it after the alcohol has been first distilled from the reaction mixture. Organic Syntheses The distillate separates into two layers; the benzyl cyanide layer is removed and distilled. Organic Syntheses When benzaldehyde is added TO THE ALCOHOLATE, and especially when the latter is still warm, local overheating results; in fact, the temperature may rise far above 100'0 with the result that benzyl ether is formed. Organic Syntheses The product obtained in this way is very pure and contains no tarry material, and, after the excess of benzyl chloride has been removed, boils practically constant. Organic Syntheses The benzyl cyanide, prepared according to the procedure as outlined, is collected over a 5'0 range. Organic Syntheses The boiling point of ethyl phenylacetate is near that of benzyl cyanide. Organic Syntheses Notes Fuming nitric acid may be used in nitrating benzyl cyanide, but the method here described is cheaper. Organic Syntheses Simultaneously, the sodium benzylate is converted into sodium benzoate, which is of no value for inducing the desired reaction, and consequently very little benzyl benzoate is obtained. Organic Syntheses Very pure benzyl cyanide will give a slightly higher yield, while commercial grades may give only 50 g. of p-nitrobenzyl cyanide and much oil. Organic Syntheses The reaction has been also carried out with 500 g. of benzyl cyanide. Organic Syntheses Under these conditions a 5-l. flask was used, and it required two and a half hours to add the benzyl cyanide. Organic Syntheses A small amount of water comes over first and is rejected; about 20 cc., containing an appreciable amount of benzyl cyanide, then distils. Organic Syntheses The benzyl alcohol used in this preparation must be free from impurities, especially aldehyde. Organic Syntheses There action, however, goes so vigorously that it is always necessary to have a trap for collecting the benzyl cyanide which is blown out of the apparatus. Organic Syntheses One hundred grams of benzyl cyanide are added to a mixture containing 100 cc. of water, 100 cc. of concentrated sulfuric acid, and 100 cc. of glacial acetic acid. Organic Syntheses |
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