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szf19900508

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专业: 配位化学

[求助] 外文翻译3

the compound of formula II may also be prepared,for example,by acetylation of a compound of the formula:III.Acetylation may be effected by any convenient method e.g.by the use of acetic anhydride(which can also serve as the solvent)together with catalytic amounts of a mineral acid e.g.sulphuric or perchloric acid,or by the use of an acid halide preferably in a polar solvent such as dimethylformamide or dimethylacetamide.where unwanted O-acetyl groupings are formed these may be removed either at this stage or after the hydroxyalkylation of the O-acetylated compound.the basic hydrolysis of the O-acetyl grouping may for example,be effected using aqueous alkali metal hydroxide,the reaction preferably being carried out at slightly elevated temperature,e.g.about 50oC

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1楼 2011-11-27 19:53:15

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xiaohanhan2007

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爱与雨下(金币+1): 2011-11-27 21:07:35
szf19900508(金币+20, 翻译EPI+1): 2011-11-29 21:23:26

引用回帖:

1楼: Originally posted by szf19900508 at 2011-11-27 19:53:15:
the compound of formula II may also be prepared,for example,by acetylation of a compound of the formula:III.Acetylation may be effected by any convenient method e.g.by the use of acetic anhydride(w ...

化学式II中的化合物也可通过将化学式III中的化合物乙酰化制得。而乙酰化过程会被任意一种简便的方法影响，例如，同时使用无水乙酸（同时可作为溶剂）和催化量的无机酸如硫酸或高氯酸，或者在极性溶剂如二甲基甲酰胺或二甲基乙酰胺中加入盐酸。那些所形成的不需要的乙酰基团可在此阶段或者对乙酰化合物进行羟烷基化之后除去。而乙酰基团的碱解可能在略高的温度如50oC时被碱金属的氢氧化物水溶液所影响。

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2楼2011-11-27 20:40:16

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