Organophosphazenes. Part 17. The synthesis of trimethylsilylacetylene and terminal acetylene derivatives of hexafluorocyclotriphosphazene
Abstract
The reactions of LiCCSiMe3 with N3P3F6 lead to the new alkynylphosphazenes N3P3F6 –n(C
CSiMe3)n(n= 1 or 2). Both the geminal and non-geminal isomers are observed in the 31P and 19F n.m.r. spectra. A reinvestigation of the reaction of LiC
CC6H5 with N3P3F6 showed that, at the stage of bis substitution, in addition to the previously reported major product, gem-N3P3F4(C
CC6H5)2, small amounts of the non-geminal N3P3F4(C
CC6H5)2 isomers are formed. The reactions of N3P3F6 –n(C
CSiMe3)n(n= 1 or 2) with KF in anhydrous ethanol lead to the terminal acetylene derivatives, N3P3F4 –n(OC2H5)2(C
CH)n(n= 1 or 2).