Synthesis and Reactivity of New Phosphorus-Nitrogen and Phosphorus-Nitrogen-BoronCondensation Monomers

摘要

The preparative chemistry of P-functional N-silylphosphoranimines,Me3,SiN=P(X)R2, and the nature of the phosphazene products of their thermal decomposition are reported with particular emphasis on the effect that the leaving group (X) has on the polymerization/cyclization process. In a related study of potential precursors to novel B-N-P-N polymers, the preparation of a series of new phosphorus-(III) and -(V) derivatives of the 1,3,2-diazaboracyclohexane ring system is described. In recent years, a new general method for the synthesis of linear and cyclic phosphazenes, has been under investigation in our laboratory. This approach, which involves the condensation polymerization of appropriate N-silylphosphoranimines, Me3SiN=P(X)R2. Is particularly well-suited to the synthesis of fully alkyl/aryl substituted polyphosphazenes. In contrast, polyphosphazenes bearing alkoxy, aryloxy, or amino