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US 4,071,549 AGranted
Process for the preparation of bis-(beta-cyanoethyl) alkyl phosphine from tris-cyanoethyl phosphine
AssigneeMonsanto Company
InventorGlenn R. Wilson
Life of this patent
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Abstract
Lower alkyl bis-(.beta.-cyanoethyl) phosphines are prepared from tris-cyanoethyl phosphine by alkylating tris-cyanoethyl phosphine to a phosphonium salt, and dequarternizing the phosphonium salt to a lower alkyl bis-(.beta.-cyanoethyl) phosphine.
Claims5
Process for the preparation of C.sub.1 -C.sub.6 clkyl bis-(.beta.-cyanoethyl) phosphine from tris-cyanoethyl phosphine comprising
- a. preparing a phosphonium sulfate of tris-cyanoethyl phosphine by alkylating tris-cyanoethyl phosphine with di(C.sub.1 -C.sub.6 alkyl) sulfate in an essentially oxygen-free reaction zone;
- b. dequarternizing the phosphonium sulfate of tris-cyanoethyl phosphine with methanolic potassium hydroxide in an essentially oxygen-free reaction zone to produce a first reaction mixture including C.sub.1 -C.sub.6 alkyl bis-(.beta.-cyanoethyl) phosphine and a precipitate being potassium methyl sulfate;
- and
- c. separating the precipitate from the remainder of the first reaction mixture.
1 more element
Process for the preparation of methyl bis-(.beta.-cyanoethyl phosphine from tris-cyanoethyl phosphine comprising sequentially:
- a. preparing a phosphonium sulfate of tris-cyanoethyl phosphine by alkylating tris-cyanoethyl phosphine with dimethylsulfate in a methanol medium in an essentially oxygen-free reaction zone;
- b. dequarternizing the phosphonium sulfate of tris-cyanoethyl phosphine in the methanol medium with potassium hydroxide in an essentially oxygen-free reaction zone to produce a first reaction mixture including methyl-(.beta.-cyanoethyl) phosphine and a first precipitate being methyl potassium sulfate;
- c. separating the first precipitate from the remainder of the first reaction mixture.
Dependencies are inferred from the claim text.