TY - JOUR Y1 - 1994/// TI - Electron ionization mass spectra of some fused pyrimidinone derivatives JF - RAPID COMMUNICATIONS IN MASS SPECTROMETRY ID - publicatio31975 N2 - The electron ionization mass spectra of 19 tricyclic fused pyrimidinone derivatives were studied. The molecular ions of almost all of these compounds were very stable and formed the base peaks of the spectra. The degree of saturation, the size and substitution of rings A and C (pyrimidinone itself is ring B) were the dominant factors affecting the type of fragmentation which, however, in general was quite simple. AV - restricted IS - 7 EP - 538 VL - 8 A1 - Mäki Esa A1 - Fülöp Ferenc A1 - Bernáth Gábor A1 - Pihlaja Kalevi UR - https://doi.org/10.1002/rcm.1290080709 SN - 0951-4198 SP - 535 ER -