3-Methyl- and 3,4-dimethylselenophenes were prepared in 78 and 80% yield, respectively, by passage of 2-methyl-l,3-butadiene and 2,3-dimethyl-1,3-butadiene driven by nitrogen through a glass tube kept at 450°C containing fragments of Pyrex glass or sand and selenium vapor.
The benzophenone sensitized photocycloaddition of 2,3-dimethylmaleimide to selenophene and 3,4-dimethylselenophene was carried out first to generalize th photoaddition reaction of methylmaleic anhydride derivatives to selenophene, using this time the nitrogen alalogue, and second to reexamine the composition of the product mixture formed in the reaction. It was found that in adition to the 1:1 adduct isolated in previous investigations, three geometrical isomers may be proposed for the 2:1 adduct (two molecules of maleimide of one of selenophene or its methyl derivative).
Jur'ew; Sadowaja, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 3154,3156; engl. Ausg. S. 3517, 3519
作者:Jur'ew、Sadowaja
DOI:——
日期:——
Jur'ew; Sadowaja, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 930,932; engl. Ausg. S. 1057
作者:Jur'ew、Sadowaja
DOI:——
日期:——
Jur'ew et al., Zhurnal Obshchei Khimii, 1959, vol. 29, p. 3647,3651; engl. Ausg. S. 3606, 3609