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Electron impact induced fragmentation of 4-aryl-4,6,7,8-tetrahydro-1H,3H-quinazolinone-2,5-diones

Mayer, Klaus K. ; Dove, Stefan ; Pongratz, Herwig ; Ertan, M. ; Wiegrebe, Wolfgang


The mol. ions (M+×) of 4-substituted aryl-4,6,7,8-tetrahydro-1H,3H-quinazoline-2,5-diones (Biginelli compds.) (2 - 18) decomp. by loss of the substituents X of the Ph group (X = o-F; o-, m-, p-Cl, Br, OCH3, CH3; 2,3-, 2,4-, 2,6-, 3,4-dichloro) giving rise to prominent (M - ×X)+ ions at 70 and 12 eV, resp. In the cases of o-Cl and o-Br substitution, the M+× is extremely unstable. In general, ...


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