Asymmetric benzoin condensation catalyzed by optically active thiazolium salts in micellar two-phase media.
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概要
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Three thiazolium salts, 3-[2-(<I>l</I>-3-<I>p</I>-menthyloxy)ethyl]thiazolium bromide (<B>1</B>), 3-(<I>l</I>-3-<I>p</I>-menthyl)thiazolium halides (<B>2</B>), and 3-(<I>l</I>-3-<I>p</I>-menthyl)-4-methylthiazolium perchlorate (<B>3</B>) have been examined for the catalysis of benzoin condensation in micellar two-phase media. The catalytic activities on the chemical yields of benzoin were observed to be high for <B>1</B> and <B>2</B> but low for <B>3</B>. On the contrary, for the asymmetric induction, 3 gave much higher optical purity of 35.3% than in the cases of <B>1</B> and <B>2</B> (0.8–3.5%). These results are discussed in terms of micellar and conformational effects.
- 公益社団法人 日本化学会の論文
著者
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Yano Yumihiko
Department Of Chemistry Faculty Of Engineering Gunma University
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Tagaki Waichiro
Department of Applied Chemistry, Faculty of Engineering Osaka City University
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Tamura Yoshiharu
Department of Chemistry, Faculty of Engineering, Gunma University
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