May 20, 1‘354
DERIVATIVES O F DICHLORODI.4MINOSTILUENEDISULFONIC
r21
ruled out a t t h a t time. The fact that the azo nitrile from methyl cyclobutyl ketone did not show this enhancement of rate strongly supports the suggestion t h a t this is a true case of hyperconjugation and not back strain-no other simple conclusion can be drawn from the evidence. The evidence indicates t h a t the formation of radical I is not ac-
CHs
CH-C
