Novel C–C reductive cleavage of terphenyls with alkali metal–hexamethylphosphoric triamide

Abstract
o-, m-, and p-terphenyls (1a—c) as well as biphenyl undergo, during alkali metal–hexamethylphosphoric triamide reduction, C–C reductive cleavage, the terphenyls giving 3-phenylcyclohexa-1,4-diene (2) and cyclohexa-1,3-diene (3) and biphenyl giving cyclohexa-1,3-diene (3).

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