Method for preparation of salts of n- phosphonomethylglycine

Details Method for preparation of salts of n- phosphonomethylglycine Method for preparation of salts of n- phosphonomethylglycine

C - Chemistry, Metallurgy

07

F

260/501.5, 260/6

C07F 9/38 (2006.01)

Patent

CA 1213903

METHOD FOR PREPARATION OF SALTS OF N-PHOSPHONMETHYLGLYCINE Abstract of the Disclosure A process for the preparation of sulfonium or sulfoxonium salts of N-phosphonomethylglycine which comprises: (1) reacting N-phosphonomethylglycine, a compound of the formu- la Image with a compound selected from the group consisting of those having the formula (a) Image wherein R1, R2 and R3 are the same or different and are alkyl groups having from 1 to 4 carbon atoms or aromatic alkyl groups, X is chloride, bromide or iodide and Z is an electron pair or oxygen, or (b) Image wherein R1, R2 and R3 are the same of different and are alkyl groups having from 1 to 4 carbon atoms and are the same as in (a) above, R4 is an alkyl group having from 1 to 12 carbon atoms, aromatic or aromatic alkyl groups, X is chlorine or iodine, and Y is nitrogen or phosphorus, said reaction being conducted in the presence of a trialkylamine of the formula (R)3N wherein each R is the same or different and is an alkyl group ranging from 4 to 13 carbon atoms, all in the presence of water and a polar func- tional organic solvent which is immiscible in water, said reaction being conducted at a temperature and for a sufficient period of time to cause completion of the reaction, and (2) isolating the end product by phase separation.

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