Process for producing carboxy-alkane-aminoalkane...

Details Process for producing carboxy-alkane-aminoalkane... Process for producing carboxy-alkane-aminoalkane...

C - Chemistry, Metallurgy

07

F

260/501.1, 260/3

C07F 9/38 (2006.01)

Patent

CA 1113475

ABSTRACT OF THE DISCLOSURE The present invention provides a process for producing carboxy-alkane-aminoalkane diphosphonic acids and carboxy-alkane- aminoaryl-alkane diphosphonic acids having the general formula Image wherein R1 is H, CH3, C2H5, C6H5, C6H11 or HOOC CmH2m where m is 2 to 5, R2 is H, CH3, C2H5, C6H5, CH2COOH or C2H4COOH, R3 is H, CH3, C2H5, -CH2C6H5, -C2H4SCH3, -CH2COOH, -C2H4COOH, or R2+R3 is Image , or R1+R2 is CmH2mCO where m is 2-5, and n is 1-4, which comprises reacting an acyl-aminocarboxylic acid or an anhydride thereof having the general formula Image wherein R1, R2, n and R3 have the meaning as above, with pyro- phosphorous acid or phosphorous acid and phosphorus trichloride in the molar ratio of 5:1 to 1:2 at elevated temperature.

337563

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