T. L. Evans

Preparation of [NP(p-OC6H4Li)2]3 by metal-halogen exchange, and its reactions with electrophiles

Abstract : The first example of a successful metal-halogen exchange reaction between n-butyllithium and a hexa(p-halogenophenoxy)cyclotriphosphazene is described. The hexalithio derivative was allowed to react with electrophiles to yield carboxylic acid, stannane, and phosphine-derivatives. (Author)

Poly(Difluorophosphazene): A New Intermediate for the Synthesis of Poly(Organophosphazenes).

Abstract Although many poly(organophosphazenes) have been synthesized, new preparative pathways are needed, especially for polymers that contain alkyl side groups. A new development involves the use of poly(difluorophosphazene), (NPC12) instead of poly-(dichlorophosphazene), (NPC12)n, as a substrate for reactions with organometallic reagents. This approach has allowed the preparation of a new class of poly(organophosphazenes) that possess substituent groups linked to the skeleton through direct phosphorus-carbon bonds. The synthesis of uncrosslinked poly-(difluorophosphazene) and its reactions with alkoxides and amines are also reviewed.