Heterocyclic studies. Part XXVII. Mass spectra of 6-(meta- and para-substituted-phenyl)-uracil and -thiouracil derivatives

Abstract

Mass spectra of 10 substituted-phenyluracils and 10 substituted-phenyl-2-thiouracils are recorded. Important steps in the fragmentation of the phenyluracils resemble those undergone by uracil itself. Spectra of 2-thioderivatives show similarities to those of corresponding uracils but some important differences are also revealed.