PROCESS FOR PREPARING CYCLOHEPTENE

摘要

The present invention provides a process for preparing cycloheptene and derivatives thereof by ring closure metathesis of asymmetric 1 8 dienes whose C C double bond in position 8 is not terminal. Cycloheptene and also its derivatives cycloheptanone cycloheptylamine cycloheptane­carbaldehyde cycloheptanecarboxylic acid and cycloheptanecarbonyl chloride and also their derivatives are important synthetic building blocks for active compounds. The ring closure metathesis is performed preferably as a reactive distillation. The asymmetric 1 8 dienes for the ring closure metathesis can be obtained by catalytic decarbonylation or oxidative decarboxylation of the corresponding unsaturated carboxylic acids and/or carboxylic acid derivatives.