Process for producing 2-(2-hydroxyphenyl) phenylphosphinic acid

Details Process for producing 2-(2-hydroxyphenyl) phenylphosphinic acid Process for producing 2-(2-hydroxyphenyl) phenylphosphinic acid

1998-04-23

2000-08-22

Ambrose, Michael G.

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

Organic compounds

Phosphorus esters

562 23, C07F 96574, C07F 930

Patent

active

06107506&

ABSTRACT:
In the coexistence of an a 5.about.20 molar excess of water based upon 2-phenylphenol compound which is reacted with phosphorus trihalide to form a 6-halo-(6H)-dibenzo[c.e][1,2]-oxaphosphorin compound and an organic solvent which is unsoluble in water and is inert in the reaction system, an organic phosphorus compound expressed by the structural formula (1) is hydrolyzed under heating to obtain a biphenyl phosphorus compound expressed by the general formula (2) and then, a cyclising dehydration reaction under heating of the resulting compound is carried out to obtain an organic phosphorus compound expressed by the structural formula (3). This constitution can produce a product of high purity and high quality without using specific chemicals or an equipment made of specific materials.

REFERENCES:
patent: 3702878 (1972-11-01), Saito
patent: 5481017 (1996-01-01), Kleiner
patent: 5650530 (1997-07-01), Buysch et al.

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