ELECTRON-IMPACT BEHAVIOR OF TRANS-4-BENZOYLAMINO-2H-1-BENZOPYRAN-3-OLS - EVIDENCE FOR AN OXYGEN MIGRATION WITH LOSS OF A BENZOPYRANONE

Certain abundant peaks in the electron impact mass spectra of a series of trans-4-benzoylamino-2H-1-benzopyran-3-ols involve the formation o f a substituted N-alkylated benzonitrile ion by a mechanism involving migration of oxygen, in a postulated four-centre skeletal rearrangemen t, leading to the loss of a benzopyranone, The presence of a small ran ge of differing substituents at three locations in this series was stu died for their effects on this proposed mechanism,