Electron impact induced migrations of aryl groups in substituted 4(3H)-quinazolinones
摘要:
AbstractElectron impact mass spectra of 2‐diphenylmethyl‐3‐aryl‐4(3H)‐quinazolinones display ions arising from migrations of different aryl groups in the molecular and [MH]+ ions. The most abundant ion due to rearrangement, [C13H9NO]+˙, is formed by migration of a phenyl from the benzhydryl group onto N‐1 and subsequent cleavage of the heterocyclic ring. Other rearrangements involve initial migration of the N‐3 aryl group to the benzylic carbon. The mechanisms of migrations were elucidated by means of deuterium and 15N labelling and are supported by metastable spectra.