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Varrentrapp reaction : ウィキペディア英語版
Varrentrapp reaction

The Varrentrapp reaction, also named Varrentrapp degradation, is a name reaction in the organic chemistry. It is named after Franz Varrentrapp, who discovered this reaction in 1840. It is an organic reaction involving the chemical decomposition of an α,β-unsaturated acid into two other acid fragments by action of molten alkali.〔F. Varrentrapp, Ann., 36, 196 (1840)〕
==General Reaction Scheme==
Because of the complex structure of this reaction it is shortened in the following scheme.
The reaction conditions are harsh: medium molten potassium hydroxide at temperatures in the range of 250 to 300 °C. Likewise cinnamic acid is converted to benzoic acid.

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