Mass spectra of some new heterocycles: cyclobutapyrimidines and their Diels–Alder adducts with C60

✍ Scribed by Roberto Martínez; Antonio Herrera; Nazario Martín; Beatriz González; Beatriz Illescas

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 79 KB
• Volume: 12
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(19980515)12:9<568::aid-rcm192>3.0.co;2-u

✦ Synopsis

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 ] Á 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.