Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus esters
Patent
1996-12-09
1999-03-09
Ambrose, Michael G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus esters
558162, C07F 912
Patent
active
058803084
ABSTRACT:
A process for preparing aromatic bisphosphates includes: a first step of reacting an aromatic monohydroxy compound having a steric hindrance group at the ortho position, with a phosphorus oxyhalide in the presence of a Lewis acid catalyst (a) to yield a reaction mixture containing diarylphosphorohalidate, and a second step of reacting the reaction mixture of the first step with an aromatic dihydroxy compound in the presence of a Lewis acid catalyst (b) to obtain an aromatic bisphosphate, wherein the aromatic monohydroxy compound and the phosphorus oxyhalide are reacted in a molar ratio of 2.0:1.0-1.1 in the first step, and the reaction mixture of the first step is subjected to a distillation treatment before the reaction of the second step, thereby obtaining the aromatic bisphosphate of high purity.
REFERENCES:
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patent: 5122556 (1992-06-01), Kambour
patent: 5420327 (1995-05-01), Bright et al.
Kosolapoff et al., "Structural Effects in Reactions of Organophosphorous Compounds. I. Reactions of Phosphorous Oxychloride with Hindered Phenols", J. Chem. Soc., pp. 815-818 (1968).
Stackman, "Phosphorous Based Additives for Flame Retardant Polyester. 2. Polymeric Phosphorous Esters", Ind. Eng. Chem. Prod. Res. Dev., vol. 21, No. 2, pp. 332-336 (1982).
Hirao Kiyoharu
Kawata Shigeru
Noguchi Kazuo
Ambrose Michael G.
Daihachi Chemical Industry Co. Ltd.
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