Ube Industries, Inc.

Ken Ikuno

Takafumi Hirakawa

Katsuhiko Mizutare

Koji Abe

Katsumasa Harada

Akio Matsushita

Noriaki Iwase

Yuichi Kotou

Yoshihiro Ushigoe

Taku Nakamura

Takashi Hosomi

Toyoaki Ihara

The present invention is a method for producing an aromatic compound by substituting the sulfonic acid group in a sulfonic acid aromatic-ester with a hydrogen atom in the presence of a platinum group metal catalyst, wherein an alkali metal carboxylate and/or an ammonium formate are made to coexist in the system. According to the present invention, an aromatic compound where the sulfonic acid group in a sulfonic acid aromatic-ester is substituted with a hydrogen atom, can be produced efficiently with good operability without using metal magnesium.

Method for producing aromatic compound

Disclosed is a method for preparing 2-mercaptothiazole, which comprises adding a dithiocarbamate salt represented by the formula (1): ##STR1## wherein M is a cation, to a chloroacetaldehyde solution in the presence of an acid.

Method for preparing 2-mercaptothiazole

Disclosed is a process for preparing 1-ethyl-5-hydroxy-pyrazole, which comprises reacting an alkyl 3-alkoxy-acrylate represented by the following formula (1): ##STR1## wherein R.sup.1 and R.sup.2 are the same or different from each other and each represent a lower alkyl group, and in the formula represents either cis- or trans-configuration, with ethylhydrazine in an amount of 1- to 10-fold mole based on 1 mole of the alkyl 3-alkoxyacrylate in a weakly basic aqueous solvent.

Process for preparing-1-ethyl-5-hydroxypyrazole

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Ube, Japan

Ken Ikuno