ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
A very convenient synthetic method is described for the known cyclic aryloxyphosphazenes [N3P3(OC6H4-R)6] (R = Br, CN, CHO, COCH3, COC6H5, and NO2). The method is based on the direct reaction of [N3P3Cl6] with six equivalents of the para-substituted phenols HOC6H4-R and K2CO3 in refluxing acetone and is characterized by very short reaction times and very simple workups, leading directly to the analytically and spectroscopically pure products in very high yields. In the cases where R = H, But, or OCH3, the reactions were much slower, but the time could be shortened by using [Bu4N]Br as the phase-transfer catalyst. Similarly, the polymers [NP(OC6H4-R)2]n can be conveniently obtained in ca. 70% and good analytical purity from polydichlorophosphazene [NPCl2]n and the para-substituted phenols HOC6H5-R (R = Br, CN, COCH3, and NO2) in the presence of K2CO3 using THF as the solvent. © 1996 John Wiley & Sons, Inc.
Type of Medium:
Electronic Resource
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