The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2007
Filed:
Oct. 26, 2004
Wen-chiung Su, Taipei, TW;
Chin-shang Sheng, Longtan Township, Taoyuan County, TW;
Wen-Chiung Su, Taipei, TW;
Chin-Shang Sheng, Longtan Township, Taoyuan County, TW;
Chung Shan Institute of Science & Technology, Taoyuan, TW;
Abstract
A method for preparing a biphenylphosphonate compound of the following formula (I): wherein n is 2 or 3; Ar is a C–Caromatic 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)—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).
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