MASS-SPECTRA FRAGMENTATION-PATTERN OF OXYGEN HETEROCYCLIC GUANIDINES

Fragmentation patterns resulting from electron impact ionisation of hi therto unknown eight tri-substituted (N-alkyl, N-aryl N'-heteroaryl) a nd two di-substituted (N-adamantyl, N'-heteroaryl) guanidines were stu died. Some major fragment ions observed in the spectra were interprete d and fragmentation patterns involving expulsion of neutral N-alkyl ca rbodiimide from the molecular ion (in the case of tri-substituted guan idines) were proposed. No such expulsion (carbodiimide elimination) to ok place in the di-substituted guanidines.