Method of preparing a phosphine compound
AssigneeCyanamid Canada Inc.
InventorsColleen E. Micklethwaite, Allan J. Robertson
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Abstract
Allylphosphines and vinylphosphines are prepared by reaction of a phosphine with an allylhalide or a vinylhalide, respectively. Preferably the phosphine is a secondary phosphine, so that there is formed an allyldialkylphosphine or a dialkylvinylphosphine. The allyldialkylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,3-bis-(dialkylphosphino)propane. The dialkylvinylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,2 bis-(dialkylphosphino)ethane. These compounds are useful as bidentate ligands.
Claims16
A process for preparing an allylphosphine or a vinylphosphine which comprises reacting, in the presence of acetonitrile and a nonpolar organic solvent, a phosphine with an allylhalide or a vinylhalide to form an allylphosphonium salt or a vinyl phosphonium salt, respectively, followed by treatment with a base to convert the phosphonium salt to the free allylphosphine or vinylphosphine base.
A process as claimed in any one of claims 1 to 5, 8 and 10 wherein water is added to the reaction mixture after the base.
Dependencies are inferred from the claim text.