ELECTRON-IMPACT MASS-SPECTRA OF SOME UNSATURATED DERIVATIVES OF 2-BENZOTHIAZOLES

The electron impact mass spectra of some p-substituted styryl-2-benzot hiazoles 1-6 and p-substituted phenyl-butadienyl-2-benzothiazoles 7 an d 8 have been recorded and the identity of various ions in the mass sp ectra established. The compounds 1-6 exibit one main fragmentation rou te which include the formation of M-1 ion as the base peak, and after elimination of p-substituted phenylacetylene molecule, the formation o f benzothiazole cation. Compounds 7 and 8 show the fragmentation pathw ay which include the formation of butadienyl-2-benzothiazole ion as th e base peak.