Nitto Chemical Industry Co., Ltd.

Mitsubishi Rayon Company, Limited

Tuyoshi Irie

Takeshi Inagaki

Takeshi Narita

Yasuyuki Takayanagi

Takeyuki Fujita

Katsumi Nakamura

Yuya Yano

Denzi Sato

N-substituted maleimides are prepared by reacting maleic anhydride with an amine in the presence of Cu or a copper compound and purifying the maleimide produced in the absence of presence of said Cu or copper compound. N-substituted maleimides are widely useful or starting materials or intermediates for medicines, agricultural chemicals, dyes, macromolecular compounds, and the like.

Process for producing N-substituted maleimides

A method for producing .alpha.,.alpha.-dimethyl-.delta.-valerolactone which comprises carrying out the addition reaction of hydrogen bromide and 2,2-dimethyl-4-pentenoic acid in the presence or absence of a catalyst to synthesize 2,2-dimethyl-5-bromovaleric acid which is then subjected to ring-closure reaction by alkali treatment.

Method for producing .alpha.,.alpha.-dimethyl-.DELTA.-valerolactone

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Kobe, Japan

Tuyoshi Irie