Method for preparing a biphenylphosphonate compound

Details Method for preparing a biphenylphosphonate compound Method for preparing a biphenylphosphonate compound

2007-05-09

2009-12-01

Shiao, Rei-tsang (Department: 1626)

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

Organic compounds

Phosphorus esters

Reexamination Certificate

active

07626051

ABSTRACT:
A method for preparing a biphenylphosphonate compound of the following formula (I):wherein n is 2 or 3; Ar is a C6-C16aromatic group; which comprising (a) reacting an o-phenylphenol with a phosphorus trichloride in the presence of a zinc chloride catalyst to form a 6-chloro-6H-dibenz [c,e] [1,2]oxaphosphorin of the following formula (II);(b) reacting a polyhydroxybenzene compound of the formula (III)in-line-formulae description="In-line Formulae" end="lead"?(HO)n—Ar  (III)in-line-formulae description="In-line Formulae" end="tail"?wherein n and Ar are defined the same as the above, with the compound of formula (II) to form a compound of the following formula (IV)wherein n and Ar are defined the same as the above; and (c) oxidizing the compound of formula (IV) in the presence of water and ozone to form the compound of formula (I).

REFERENCES:
patent: 6440891 (2002-08-01), Maas et al.

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