ELECTRON-IMPACT MASS-SPECTRAL STUDY OF 2-ALLYLOXY-6-PHENYL-4-TRIFLUOROMETHYL PYRIDINES AND N-ALLYL-6-PHENYL-4-TRIFLUOROMETHYL-2 (1H)-PYRIDONES

The mass spectrometric behaviour of some new 2-allyloxy-6-phenyl-4-tri fluoromethyl pyridines and N-allyl-6-phenyl-4-trifluoromethyl-2(1H)-py ridones have been studied with the aid of metastable ion, collision in duced dissociation and high resolution techniques. The major fragmenta tions observed in the O-allyl and N-allyl compounds involve the losses of H-., CH3., CHO. and C6E5. from the molecular ion. The O-allyl and N-allyl compounds can be readily distinguished by the marked differenc es in the abundances of various diagnostic ions. A McLafferty rearrang ement in both the compounds leads to an ion of m/z 239, for which a 4- trifluoromethyl-6-phenyl-2-pyridone (4) structure has been proposed, T his has been further supported by a CID study using the reference comp ound 4. (C) 1998 John Whey & Sons, Ltd.