Patent ID: 7517869

Claim:
A process for the synthesis of a fluorophosphonocinnamic compound of the general formula X being selected from the group consisting of: an oxygen atom and a sulfur atom, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 being selected from the group consisting of: H, an alkyl group, an aryl group, OH, O-alkyl, S-alkyl, NH 2 , NH-alkyl, and N-(alkyl) 2 , R 7 being selected from the group consisting of: H, an alkyl group, an aryl group, and a silyl group, R 8 being selected from the group consisting of: H, an alkyl group, and an aryl group, said alkyl and aryl groups containing from 1 to 6 linearly bonded carbon atoms, comprising: fluorinating a phosphonocinnamic compound of the general formula: X being selected from the group consisting of: an oxygen atom and a sulfur atom, R′ being selected from the group consisting of: a group S-alkyl, S-aryl, S-amine, S-amide, NH-alkyl, NH-aryl, N-(alkyl) 2 , and N-(aryl) 2 , R 7 , being selected from the group consisting of: H, an alkyl group, and an aryl group, said alkyl and aryl groups containing from 1 to 6 linearly bonded carbon atoms, or of a phosphonocinnamic compound of the general formula: TBDPS denoting a tert-butyldiphenylsilyl group, by reacting the phosphonocinnamic compound, at a temperature of from −20° C. to 85° C., with at least one fluorinating agent comprising a complex formed between a tertiary amine, denoted R 3 N, and hydrogen fluoride; said tertiary amine being substituted by alkyl groups containing from 1 to 6 linearly bonded carbon atoms.