METHOD FOR THE PRODUCTION OF 5H-DIBENZO(A,D)CYCLOHEPTEN-5-ONES

摘要

5H-Dibenzo[a,d]cyclohepten-5-ones (I) (I) (A and B being radicals for completing aromatic ring systems) are prepared by converting (Z)-2-(2-arylethenyl)arylcarboxylic acids (II) (II) or E/Z-isomer mixtures thereof with a halogenating agent for carboxylic acids at from (-30 DEG ) to +120 DEG C. to the corresponding carbonyl halides (III) (III) where X is halogen, and cyclizing said carbonyl halides at from 0 DEG to 100 DEG C. in the presence of a Lewis acid.