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86wangxin

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[交流] 【求助】酒石酸+尿素已有2人参与

A ground mixture of (*)-tartaric acid (42 g) and urea (13 g )
was slowly added to stirred conc. H2SO4 (100 cm3) the rate
being adjusted so that the temperature did not exceed 65 "C
without external cooling. The resultant mixture was heated at
80 "C for 1 h, cooled to 20 "C and poured on crushed ice (1 kg).
The resulting precipitate was filtered off and washed with water
(0.5 dm3) and acetone (100 cm3) to afford 4-carboxyimidazolin-
2-one
酒石酸和尿素在浓硫酸催化下合成4-羧基-2-酮基咪唑。
实验后倒入碎冰中没有沉淀物。原因是什么啊？

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1楼 2010-04-07 20:23:29

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mooncakexzj

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引用回帖:

Originally posted by 86wangxin at 2010-04-07 20:23:29:
A ground mixture of (*)-tartaric acid (42 g) and urea (13 g )
was slowly added to stirred conc. H2SO4 (100 cm3) the rate
being adjusted so that the temperature did not exceed 65 "C
without ...

是不是你的温度太高了，加的有点快了，弄的分解了？