Racemization of mandelic acid at the surface of talc powder.

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概要

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• The addition of talc powder in an ethanolic solution of mandelic acid gave a large change of its optical rotation. It was confirmed by absorption spectrography, thin-layer chromatography, and gas chromatography that mandelic acid was racemized at the surface of the talc powder. The IR spectra showed that racemization took place when mandelate anions adsorved weakly at the surface of the talc. It was concluded that the H atom at the C atom in the second position of a mandelate anion was adsorbed at a basic site of the talc surface to deprotonate and also that the deprotonation was enhanced by the interaction between the carboxyl group and an acidic site.

• 公益社団法人 日本化学会の論文

著者

• Hayakawa Sohachiro

  Laboratory of Applied Physics, Faculty of Engineering, Chiba University

• Ikekawa Akiko

  Faculty of Pharmaceutical Sciences, Showa University

関連論文

• Mechanochemical racemization of L-leucine.
• Mechanochemical change in the solid state of hexobarbital.
• The solubility of ball-milled amobarbital and the stability of its amorphous state.
• Racemization of mandelic acid at the surface of talc powder.

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