Synthese von Benzofulvenen und Dibenzofulvenen über 1‐Chloralkyl‐acetate

Abstract

Synthesis of benzofulvenes and dibenzofulvenes via 1‐chloroalkyl‐acetates 1,2‐Benzofulvene (6a) and 1,2,3,4‐dibenzofulvene (7a) as well as the corresponding 6‐methyl‐ and 6‐phenyl‐derivatives are prepared by reaction of sodium indenide and sodium fluorenide with 1‐chloroalkyl acetates (3) , followed by elimination with KOC(CH 3 ) 3 . The over‐all yields are comparable with the results of the fulvene series and are in most cases considerably higher than the yields of the Thiele ‐method.