Preparation of phosphorus-containing compounds useful in the preparation of biphosphine ligands
AssigneeSRI International
InventorsRoelof Van Ginkel, Alexander Van Der Made, Jan De With, Wolf Eilenberg
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Abstract
This invention relates to processes for making phosphorus compounds R2P—X—PR2, R2P-M, R2P-L and R3P, and the novel cation R2P+(L)-X—P+(L)R2, where R represents an optionally substituted hydrocarbyl group, X represents a bridging group, L represents a leaving group and M represents an alkali metal atom. The invention relates further to a process for making a compound R2P-L from a compound R—H via a new process for making the compound R—Li followed by its reaction with a compound Hal2P-L. The compound R2P—X—PR2 is a ligand suitable for making catalysts for copolymerizing carbon monoxide and a olefinically unsaturated compound.
Claims10
A process for the preparation of a compound of the formula
- R2P-L
- wherein R is hydrocarbyl or substituted hydrocarbyl and L is an amine, alkoxy, aryloxy, alkylthio, or phosphine leaving group, said process comprising:
- reacting of a compound of the formula
- R—Li
- with a compound of the formula
- Hal2P-L
- wherein Hal represents a halogen atom, in a solvent comprising an ether compound of the formula
- E1-O-E2
- wherein each of E1 and E2 independently represent an optionally substituted alkyl group or an optionally substituted aryl group, and having a boiling point of at least 40° C. at atmospheric pressure.
Dependencies are inferred from the claim text.