例句與造句

1. Since heroin is one of a series of 3, 6 diesters of morphine, it is possible to convert morphine to nicomorphine ( Vilan ) using nicotinic anhydride, dipropanoylmorphine with propionic anhydride, dibutanoylmorphine and disalicyloylmorphine with the respective acid anhydrides.
2. ?-Methylacetylfentanyl was sold briefly on the black market in the early 1980s, before the introduction of the Federal Analog Act which for the first time attempted to control entire families of drugs based on their structural similarity rather than scheduling each drug individually as they appeared . ?-Methylacetylfentanyl is made with the same synthetic route as ?-methylfentanyl, but by substituting the relatively common acetic anhydride for the more difficult to obtain chemical propionic anhydride in the synthesis.
3. Rxn of " p "-fluorobenzyl chloride ( "'1 "') with the anion of diethylmethyl malonate ( "'2 "') gives intermediate diester ( "'3 "'), saponification of which and subsequent decarboxylation leads to "'4 "'. { Alternatively it can be formed by Perkin reaction between p-fluorobenzaldehyde and propionic anhydride in the presence of NaOAc, followed by catalytic hydrogenation of the olefinic bond using a palladium on carbon catalyst .}
4. It's difficult to find propionic anhydride in a sentence. 用propionic anhydride造句挺難的