Condition-Driven Selective Syntheses of Dialkyl Diselenides Involving Elemental Selenium and Sodium Borohydride
作者:Alain Krief、Michel Derock
DOI:10.1055/s-2005-864814
日期:——
Dialkyl diselenides have been prepared from alkyl halides, sodium borohydride and elemental selenium using two different methods. One of them involves the intermediate formation of diselenide dianion equivalent (-SeSe-).
Synthesis of diselenides and selenides from elemental selenium
作者:Alain Krief、Michel Derock
DOI:10.1016/s0040-4039(02)00277-0
日期:2002.4
Sodium hydride is able to reduce elemental selenium to sodium diselenide (Na2Se2), but not to sodium selenide (Na2Se). Dialkyl diselenides and even dialkyl selenides, including unsymmetrical dialkyl selenides, can be nevertheless synthesized using the proper Se/NaH ratio (1/1 or 1/2).
氢化钠能够将元素硒还原为二硒化钠(Na 2 Se 2),但不能还原为硒化钠(Na 2 Se)。尽管如此,仍可以使用适当的Se / NaH比(1/1或1/2)合成二烷基二硒化物,甚至二烷基硒化物,包括不对称的二烷基硒化物。
Conditions-Driven Selective Synthesis of Selenides and Selenols from Elemental Selenium
Sodium borohydride in DMF is able to reduce elemental selenium in the presence of ethanol. Alkylation of the species resulting from the reaction of 2:1 molar equivalents of NaBH4/Se allows the selective synthesis, under very mild conditions, of symmetrical dialkyl selenides. Addition of formic acid, prior to that of the electrophile, permits the synthesis of the corresponding selenols.
Reactions of Selenobenzamide and Alkyl Halides. Synthesis of Dialkyl Selenides and Diselenides
作者:Xiao-Bo Zhang、Ming-De Ruan、Wei-Qiang Fan
DOI:10.1080/00397919608004792
日期:1996.12
Abstract In the absence of base, the reaction of selenooenzamide with alkyl halides gives the dialkyl diselenides as the major product. While the reaction of selenobenzamide and an alkyl halide is carried out in a 1:2 molar ratio and in the presence of strong base, the dialkyl selenides predominate.
Reduction of Selenium with BER in Methanol. Application to Synthesis of Dialkyl Selenides
作者:Kazuo Yanada、Tetsuro Fujita、Reiko Yanada
DOI:10.1055/s-1998-1848
日期:1998.9
Selenium was reduced with borohydride exchange resin (BER) in methanol at room temperature to give probably a selenide exchange resin. It reacted with alkyl halide or tosylate to give dialkyl selenides selectively in a quantitative or high yield without forming toxic hydrogen selenide and/or foul-smelling selenol.