Synthese von Benzofulvenen und Dibenzofulvenen über 1‐Chloralkyl‐acetate
1977
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(CH3)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.
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