Method for preparation 3-(hydroxyphenylphosphinyl)-propanoic aci

Details Method for preparation 3-(hydroxyphenylphosphinyl)-propanoic aci Method for preparation 3-(hydroxyphenylphosphinyl)-propanoic aci

1999-10-12

2000-07-18

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

C07F 930

Patent

active

060909765

ABSTRACT:
Disclosed is a method for the preparation of 3-(hydroxyphenylphosphinyl)-propanoic acid which is commonly used as a flame retardant for polyester resins. The preparation of 3-(hydroxyphenylphosphinyl)-propanoic acid is attained by the condensation of phenylphosphonous dichloride and acrylic acid and the hydrolysis of the condensate. In the condensation, the mole ratio of phenylphosphonous dichloride to acrylic acid is within the range of 1:1.1 to 1:1.25. Under a pressure of greater than 1 atm, acrylic acid is added at 65.about.110.degree.C. at an amount more by 10.about.25 mole % than that of phenylphosphonous dichloride and the condensation is carried out at a temperature of 70.about.100.degree. C. under at greater than 1 atm, to produce 3-(hydroxyphenylphosphinyl)-propanoic acid at high yields with desired color.

REFERENCES:
patent: 4769182 (1988-09-01), Hazen
patent: 5334760 (1994-08-01), Wachi et al.
patent: 5349069 (1994-09-01), Thottahil et al.

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