RELATIONS STRUCTURE-FRAGMENTATIONS SOUS IMPACT ELECTRONIQUE EN SERIE AZA-4 DIOXA-2,7 PHOSPHA-3 BICYCLO(4.4.0)-DECANE

Abstract

The electron-impact-induced fragmentations at 70 eV and lower energies of ten compounds in the 4-aza-2,7-dioxa-3-phospha-3-X-3-Y-bicyclo(4.4.0)decane series have been examined. The spectra are interpreted in terms of the influence of the phosphorus atom configuration on the fragmentation patterns. Thus, it is shown that compounds 1a, 2a, 3a, 4a with the P[dbnd]S bond axially oriented lose HS · radical more easily than their epimers at phosphorus. Other cleavage processes with charge retention on the hydrocarbon fragments are also typical of the configurations, namely losses of HPOXY, HNPOXY and H₂NPOXY groups which occur with rearrangment of one or two hydrogens.