Patent ID: 6548708
Filing Date: 2003-04-15
Classification: C07F

Abstract:
A process for the preparation of a compound of formula (I)R2Pâ€”Xâ€”PR2â€ƒâ€ƒ(I) wherein R is hydrocarbyl or substituted hydrocarbyl, and X is a bivalent organic bridging group containing at least one and up to four bridging atoms, said process comprising: (a) reacting a compound of formula (IV)R2Pâ€”L,â€ƒâ€ƒ(IV) wherein L is an amine, alkoxy, aryloxy, alkylthio, or phosphine leaving group, with lithium, to produce an intermediate compound of formula (IX)R2Pâ€”Li; andâ€ƒâ€ƒ(IX) (b) reacting said intermediate compound with a compound of formula Hal-X-Hal wherein Hal is a halogen atom.