Kuraray Co., Ltd.

Kensuke Nagashima

Naoki Fujiwara

Hiroyuki Nohira

Yoshin Tamai

Keisuke Morikawa

Koichi Kanehira

Masahiro Torihara

Katsuji Ujita

Yusuke Amano

Tatsuhiko Hayashibara

Takuma Kaneshima

Kojiro Hara

The present invention provides a vinyl alcohol polymer having a mercapto group and having excellent reactivity. The present invention is a side-chain mercapto group-containing vinyl alcohol polymer including vinyl alcohol units and structural units represented by the following formula (I) (the characters in the formula are as defined in the description): 

Vinyl alcohol polymer, method for producing same, and composition and coating agent containing vinyl alcohol polymer

Process for the preparation of benzyloxyacetaldehyde

In optical resolution of an optically inactive (.+-.)-cis-4-aminocyclopent-2-en-1-carboxylic acid derivative into its (+)-derivative and (-)-derivative, the (.+-.)-cis-4-aminocyclopent-2-en-l-carboxylic acid derivative is allowed to react with an optically active cis-2-(arylalkylamino)cyclohexanemethanol or optically active .alpha.-alkylbenzylamine serving as an optically resolving agent, to form diastereomer salts corresponding to the (+)-cis-4-aminocyclopent-2-en-1-carboxylic acid derivative and the (-)-cis-4-aminocyclopent-2-en-1-carboxylic acid derivative.

Process for optical resolution of

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Kurashiki, Japan

Kensuke Nagashima