1, 2-Cyclononadiene (1) reads with phenyl azide (2a) and rl-bromophenyl azide (2b) to give conjugated triezoline adducts 3a and 3b, respectively.(R)-(+)-l and 2a react to give (S)-(+)- 3a, which is consistent with a concerted cycloaddition mechanism. The reaction of 1, 2- propadiene (6) and 2a gives triazoles 8 and 10 plus compound 18 in nearly equal amounts. The formation of these produds is rationalized by a scheme involving initial formation of ...
