Process for preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-

Details Process for preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene- Process for preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-

1984-07-19

1985-12-24

Reamer, James H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 80, 568319, C07C 4545

Patent

active

045607877

ABSTRACT:
The present invention relates to a method of preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-5-one or substitution products thereof from dibenzyl-o-carboxylic acid or its corresponding substitution products, by cyclocondensation. The cyclocondensation is performed in either of two ways, namely (a) with catalytic amounts of a concentrated acid as catalyst, or (b) with the aid of di- and/or trichloromethyl aromatic compounds in the presence of catalysts, preferably catalysts from the group of the Lewis acids.

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