Ufc Corporation

Labeltek Inc.

Taiwan Salt Industrial Corporation

Kuan-Chieh Tseng

Ling Lu

Shyue-Ming Jang

Po-Han Huang

Yu-Chin Lee

Chyuan Juang

Bang-I Liou

Kai-Chiang Huang

Chung-Ning Fan

Yu-Cheng Lee

Tien-Wen Lo

Chun-Liang Lai

Chia-Hung Yeh

Charng-Lih Jeng

Yuan-Szu Chang

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.

Method for synthesizing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or a derivative thereof

A method for preparing three types of benzidine compounds in a specific ratio, the method uses two types of diphenylamine compounds and one type of biphenyldihalide compound in a specific ratio as reactants to mix with an organic solvent and an additive to synthesize benzidine compounds in one step. The synthesized three types of benzidine compounds specially perform in a designated mixturing ratio having excellent photoelectric characteristics for a charge transporting layer in an organic photo-conductive drum.

Method for preparing three types of benzidine compounds in a specific ratio

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Pingtung County, Taiwan

Kuan-Chieh Tseng