Mass spectrometric beheviour of some 5,5-diphenylglycocyamidine and -hydantoin derivatives

The mass spectra and main fragmentation pathways are presented for thirteen 1- and 3-substituted 5,5-diphenylglycocyamidine and -hydantoin derivatives. The principal decomposition routes of these compounds are also of diagnostic value for ascertaining positional isomerism when the substituents are eliminated in the initial stage of fragmentation.