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szf19900508鐵蟲 (初入文壇)
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[求助]
外文翻譯3
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| 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 |
捐助貴賓 (小有名氣)
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化學(xué)式II中的化合物也可通過將化學(xué)式III中的化合物乙酰化制得。而乙酰化過程會(huì)被任意一種簡便的方法影響,例如,同時(shí)使用無水乙酸(同時(shí)可作為溶劑)和催化量的無機(jī)酸如硫酸或高氯酸,或者在極性溶劑如二甲基甲酰胺或二甲基乙酰胺中加入鹽酸。那些所形成的不需要的乙;鶊F(tuán)可在此階段或者對乙;衔镞M(jìn)行羥烷基化之后除去。而乙;鶊F(tuán)的堿解可能在略高的溫度如50oC時(shí)被堿金屬的氫氧化物水溶液所影響。 |
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