The reaction between sodium 2,2,2-trifluoroethoxide and hexachlorocyclotriphosphazene (I) yielded nine cyclotriphosphazenes of the formula N3P3(OCH2CF3)nCl6-n where = 1-6. Nuclear magnetic resonance analysis indicated that these products were compounds II-X. This constitutes the first isolation and identification of a complete series of alkoxychlorocyclophosphazenes. The reaction was found to follow almost exclusively a trans-nongeminal pathway, and a steric rather than an electronic “cis effect” is postulated to account for this pattern. Dipole moments were measured, but these were shown to be unsuitable for isomer identification, presumably because of the presence of the bulky, nonrigid trifluoroethoxy groups and a nonvanishing ring moment. The applicability of these results to related high molecular weight polyphosphazene systems is discussed.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry