... Volume: Page: ... or C 6 H 5 Me, and [N 3 ] = 2,6-(2,4,6-(CH 3 ) 3 C 6 H 2 N═CCH 3 ) 2 C 5 H 3 ... The 1 H NMR spectrum of 4a in solution shows four resonances determined as imine methyls, two pairs of o-mesityl methyls, and p-mesityl methyls, which is consistent ...