Synthesis of 2-Naphthylacetylene Selenides from 4-(2-Naphthyl)-1,2,3-selenadiazole

Resumo

4-(2-Naphthyl)-1,2,3-selenadiazole under the action of bases eagerly decomposes with liberation of nitrogen to form potassium 2-(2-naphthyl)ethyneselenolate. By further treatment of the reaction mixture with the excess of alkyl halide the corresponding methyl- and butyl-2-(2-naphthyl)-1-ethynyl selenides were obtained. In the absence of alkyl halides treating with the potassium hydroxide ethanol solution yields 4-(2- naphthyl)-2-[1-(2-naphthyl)-2-[1-(2-naphthyl)methylidenee]-1,3-diselenol.