Nippon Shokubai Kagaku Kogyo Co., Ltd.

Yumi Hatta

Noboru Sugishima

Noriaki Ikeda

Ryuji Aoki

Yasushi Fujii

A process for preparation of a 2-substituted-1,4-naphthoquinone which comprises oxidizing a 2-substituted naphthalene to obtain reaction products comprising a 2-substituted-1,4-naphthoquinone and a 6-substituted-1,4-naphthoquinone; adding a diene compound to the reaction products and heating the mixture to form a Diels-Alder reaction adduct between the diene compound and the 6-substituted-1,4-naphthoquinone in the reaction products; and separating the 2-substituted-1,4-naphthoquinone from the adduct.

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Himeji, Japan

Yumi Hatta