Synthesis of Cyclic Phosphazenes with Isothiocyanato, Thiourethane, and ThioureaSide Groups: X-Ray Crystal Structure of N3P3(NMe2)3(NCS)3

摘要

Cyclic and high-polymeric phosphazenes have been prepared that bear a widevariety of organic, organometallic, and inorganic side groups. Hexachlorocyclotriphosphazene and the cyclic tetrameric analogue 2 undergo a ring-opening polymerization when heated at 250 C to form poly(dichlorophosphazene), and the chloro units of species can be replaced by organic side groups via nucleophilic replacement reactions. Small molecule phosphazenes serve as small molecule models for the development of similar chemistry at the high-polymeric level.