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. 21, 2011
Filed:
Aug. 05, 2009
Ling LU, Taipei Hsien, TW;
Kai-chiang Huang, Taoyuan Hsien, TW;
Kuan-chieh Tseng, Pintung Hsien, TW;
Chung-ning Fan, Taoyuan Hsien, TW;
Yu-cheng Lee, Miaoli Hsien, TW;
Tien-wen Lo, Taoyuan Hsien, TW;
Yu-chin Lee, Taipei, TW;
Ling Lu, Taipei Hsien, TW;
Kai-Chiang Huang, Taoyuan Hsien, TW;
Kuan-Chieh Tseng, Pintung Hsien, TW;
Chung-Ning Fan, Taoyuan Hsien, TW;
Yu-Cheng Lee, Miaoli Hsien, TW;
Tien-Wen Lo, Taoyuan Hsien, TW;
Yu-Chin Lee, Taipei, TW;
UFC Corporation, Taipei, TW;
Abstract
A method for synthesizing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivatives has a step of introducing 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin or its derivative, an acid compound and water into a reacting chamber to form an organic layer having 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivative and an aqueous layer. Because the acid compound is from an external source and has a catalyzing effect, employing the method can prevent side reaction from occurring and increase yield of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivative. Furthermore, the method is a one-pot operation of hydrolysis, dehydration and cyclization, so the method does not require purification of intermediates. Therefore, the method is time- and cost-saving and requires less organic solvent, resulting in less pollution to the environment.