Reductive Cleavage of Se-Se and Te-Te Bond by Samarium Diiodide: Synthesis of Selenoesters, Telluroesters, Unsymmetrical Alkylphenyl Selenides and Tellurides
作者:Yongmin Zhang、Yongping Yu、Ronghui Lin
DOI:10.1080/00397919308009767
日期:1993.1
Abstract The reduction of diaryl diselenides and ditelluides by samariumdiiodide led to samarium arylselenolates and samarium aryltellurolates respectively (ArSeSmI2 and ArTeSmI2). These species reacted smoothly with acyl halides and alkylhalides to give selenoesters and alkylselenides or telluroesters and alkyl-tellurides in good yields under mild and neutral condition.
Facile Reaction of<i>Te</i>-Aryl Benzenecarbotelluroates, ArCOTeAr′, with Methyl Iodide and Halogens
作者:Harkesh B. Singh、Narasimhan Sudha
DOI:10.1246/bcsj.61.3735
日期:1988.10
Reaction of Te-aryl benzenecarbotelluroates of the type ArCOTeAr′ (Ar=phenyl p-tolyl, p-bromophenyl; Ar′=phenyl, p-methoxyphenyl) with methyl iodide was found to give symmetrical telluronium salts, [Ar′Te(CH3)2]+I− in good yields. The reactivity of one of these benzene carbotelluroates towards halogens was also examined.
efficient reagent for the reductivecleavage of the tellurium-tellurium bond of ditelluride. Alkyl phenyl tellurides were prepared by the reaction of diphenyl ditelluride with primary and secondary alkyl halides in the presence of lanthanum metal and a catalytic amount of iodine in moderate to good yields. The reaction was accelerated by the addition of HMPA. In addition, the reduction of ditelluride with
of cerium trichloride and samarium intetrahydrofuran to produce the aryltellurolates. This “living” tellurolate anion species reacted smoothly with acid chlorides and acid anhydrides to afford telluroesters in good yields under mild and neutral conditions.
Palladium-Mediated Reactions of Chloroformates with Phenylselenotris(trimethylsilyl)silane and Aryltellurotris(trimethylsilyl)silane: Improved Procedure for the Preparation of (Phenylseleno)- and (Aryltelluro)formates