Benzenediazonium ions: structure, complexation, and reactivity
No evidence was obtained from 15N n.m.r. spectroscopy for the scrambling of the nitrogens of benzenediazonium ions in solution or during coupling. The 15N chemical shifts in acetonitrile solution are modified on complexation with a crown ether. The scope of crowns as phase-transfer catalysts for azocoupling reactions has been examined.