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US4520209A Process for cyclizing upsilon-chlorocarboxylic acids 失效
使上 - 次氯羧酸环化的方法

Process for cyclizing upsilon-chlorocarboxylic acids
摘要:
.gamma.-chlorocarboxylic acid methyl or ethyl esters are cyclized to the corresponding cyclopropane carboxylic acid esters by employing the sodium or potassium alcoholate of methanol or ethanol in the presence of the same alcohol at a temperature above the boiling point of the alcohol employed.
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