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■ Preparation and Assignment of Selenium Analoges of Benzo-1,2-dithiole-3-thione

Shigeru Oae, Keishi Sakai, Mitsuo Fukumura, Seizo Tamagaki, Yashiki Matsuura, and Masao Kakudo

*Department of Chemistry, University of Tsukubaa, 1-1-1 Ten-nodai, Tsukuba-shi, Ibaraki, 305-8571, Japan

Abstract

The product formed in the reaction of benzo-3-methylthio-1,2-dithiolium iodide with sodium hydrogen selenide was assigned as benzo-1,2-thiaselenole-3-thione(I) by X-ray crystallographic techniques. (I) crystallizes in a monoclinic space group P2₁/c with a=13.01, b=4.10, c=28.51 Å, β=90.50° and z=8. While, treatment of benzo-3-chloro-1,2-dithiolium perchlorate with sodium O,O-diethyl phosphoroselenate gave benzo-1,2-dithiole-3-selone(II) in a moderate yield. The structure of the compound(II) has also been confirmed by X-ray crystallographic techniques. (II) crystallizes in a monoclinic space group P2₁/c with a=4.06, b=10.83, c=17.75 Å, β=98.81° and z=4. Selone(II) was isomerized to the thione(I) thermally, whereas the latter (I) was not converted to any other product.