Nippon Soda Co., Ltd.

Yutaka Takakura

Shigeru Kojima

Akiyoshi Ueda

Fumihiko Nagasaki

Tatsumi Kobayashi

Sadafumi Yoshino

Humiko Nagasaki

Yoshiaki Fukuda

Humihiko Nagasaki

Process for producing the 3-chloro-1-formyl-4-phenylpyrroles

There is a method for the production of 3-phenylpyrrole derivatives having the general formula ##STR1## wherein X is halogen, nitro or haloalkyl having 1 to 3 carbon atoms;

Phenylbutyraldehydes

Method for the production of 3-phenylpyrrole

Diaminomaleonitrile which is produced by the tetramerization of hydrogen cyanide is purified by heating a crude diaminomaleonitrile in an inert liquid or in an inert atmosphere at a temperature of 90.degree. to 140.degree. C, preferably 100.degree. to 120.degree. C, and then extracting pure diaminomaleonitrile having a purity of about 99% from said heated crude diaminomaleonitrile with a solvent.

Process for the purification of diaminomaleonitrile

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Kanagawa, Japan

Yutaka Takakura