Electron impact fragmentation of some mixed cyclotetraphosphazenes

✍ Scribed by T. Tunde Bamgboye; Omolara A. Bamgboye

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 448 KB
• Volume: 20
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210200802

✦ Synopsis

The electron impact fragmentations of some cyclotetraphosphazenes are reported and discussed. The major fragmentation path involves loss of two amine radicals and one chlorine radical in the series PfiN,Ck,(NMe2), when n = 2, and subsequent stages involve a ring contraction process with elimination of a P = N fragment, when n = 5 loss of amine radicals predominates on statistical grounds with little evidence of ring contraction. In the series PJK+Fs,(NM&,, fragmentation is dominated by loss of amino radicals when n = 4 and loss of fluorine radicals predominates on statistical grounds when n = 2. In the series Pfi&,X, (n = 2 or 4, X = C1 or Br), when n = 2 and X = Br the major fragmentation path is the loss of two bromine radicals, whereas when X = C1 the more favoured path is the loss of two chlorine radicals. In both, subsequent stages involve ring contraction reactions with elimination of a PN fragment. When n=4 and X = Br or c1 on bond energy grounds the more favoured fragmentation pattern is the loss of bromine or chlorine radicals, respectively.

OWiley Heyden Ltd, 1985

EXPERIMENTAL

All the compounds were prepared by methods already described7-" and were isolated by gas-liquid chromatography. The mass spectra were obtained at 70 eV on an AEI MS902 mass spectrometer. Liquid samples were admitted through the all-glass heated inlet system while for solids direct insertion was used.