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Mass spectra of some new heterocycles: cyclobutapyrimidines and their Diels–Alder adducts with C 60
Author(s) -
Martínez Roberto,
Herrera Antonio,
Martín Nazario,
González Beatriz,
Illescas Beatriz
Publication year - 1998
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19980515)12:9<568::aid-rcm192>3.0.co;2-u
Subject(s) - chemistry , cyclobutadiene , adduct , mass spectrum , fragmentation (computing) , pyrimidine , medicinal chemistry , ion , spectral line , ring (chemistry) , diels–alder reaction , computational chemistry , photochemistry , stereochemistry , organic chemistry , molecule , catalysis , physics , astronomy , computer science , operating system
The electron impact mass spectra of new compounds, 2,4‐dialkyl and 2,4‐diaryl substituted‐5,6‐dihydrocyclobuta[ d ]pyrimidines, are reported. The main fragmentation pathway leads to the formation of cyclobutadiene [C 4 H 4 ] ·+ m/z = 52 as the base peak. The FAB spectra of the adducts of cyclobutapyrimidines with C 60 have also been recorded. In these spectra the dominant peaks are formed by a retro‐Diels–Alder reaction and by the apparent loss of the substituents attached at the pyrimidine, ring forming the ions m/z = 720 and m/z = 825, respectively. © 1998 John Wiley & Sons, Ltd.