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A one‐pot synthesis of 1‐alkylidenephthalanes from 3‐(2‐bromophenyl)propyne derivatives has been developed. 3‐(2‐Bromophenyl)propynal acetals 9 and corresponding orthoester 19 were treated successively with n‐butyllithium and various aldehydes and ketones at low temperature to obtain 1‐alkylidenephthalanes 10 and 20 with various functional groups at the exocyclic methylene moiety. Halogen‐metal exchange,...
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