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86wangxin

新虫 (小有名气)

[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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mooncakexzj

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小木虫(金币+0.5):给个红包,谢谢回帖交流
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?
海上生明月,天涯共此时!
2楼2010-04-07 20:25:30
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86wangxin

新虫 (小有名气)

引用回帖:
Originally posted by mooncakexzj at 2010-04-07 20:25:30:

是不是你的温度太高了,加的有点快了,弄的分解了?

温度没错。我找不到原因。明天又要被老师骂了。
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3楼2010-04-07 20:27:55
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