Concerted rotational-inversion process in 5-acyl-10,11-dihydrodibenz[b,f]azepines

Abstract
Detailed analysis of the temperature-dependent 1H n.m.r. spectra of 5-acyl-10,11-dihydrodibenz[b,f]azepine (N-acyliminobibenzyl) derivatives suggests the occurrence of three conformational equilibria–rotation of the ethano-bridge section, rotation of the amide C–N bond, and inversion of the central seven-membered ring; ring inversion and amide rotation occur in a novel, concerted manner.

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