The photochemistry of 1, 2-diazenes (azo compounds) has been intensively studied because of its potential synthetic utility,'the unique dependencies on structural variations, 2 and the theoretical interest in this simple chrom~ phore.~,~ We describe herein the photochemistry of 2, 3-diazabicyclo [2.1. 1] hex-2-ene (1), 5 the smallest and most strained member of the series of homologous bicyclic azoalkanes. This simple compound displays ...