專利摘要：
A method for preparing a biphenylphosphonate compound of the following formula (I):
wherein n is 2 or 3; Ar is a C 6-C16 aromatic 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)
(HO) n--Ar (III)
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).