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).
W. Kotlarek and R. Pacut, J. Chem. Soc., Chem. Commun., 1978, 153 DOI: 10.1039/C39780000153
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