PYROLYSIS OF TRIPHENYL (DIPHENOXYPHOSPHINYL)PHOSPHORIMIDATE

The pyrolysis of triphenyl (diphenoxyphosphinyl)phosphorimidate (1) wa s investigated using differential thermal analysis-thermogravimetry (D TA-TG), thermogravimetry-mass spectrometry (TG-MS), infrared spectrosc opy (IR), mass spectrometry (MS), high performance liquid chromatograp hy (HPLC) and the P-31 nuclear magnetic resonance method (P-31 NMR). T he cleavage of 1 by electron impact (EI) was also investigated, the re sults were used to elucidate the pyrolysis process. Compound 1 decompo sed on heating to form phenol, triphenyl phosphate, hexaphenoxycyclotr iphosphazene, octaphenoxycyclotetraphosphazene, triphenyl sphinyl)-P,P -diphenoxyphosphinimyl]phosphorimidate and longer-chain phosphazene co mpound (PhO)(2)P(O)N=P(OPh)(2)N=P(OPh)(2)N=P(OPh)(3). In mass spectrom etric analysis, 1 was cleaved by the elimination of a phenoxyl radical , similar to pyrolysis, the formation of the ion assigned to triphenyl phosphate was observed. (C) 1998 Elsevier Science B.V. All rights res erved.