Telluroxide elimination by direct oxidation of alkyl phenyl telluride
作者:Sakae Uemura、Kouichi Ohe、Shin-ichi Fukuzawa
DOI:10.1016/s0040-4039(00)61958-5
日期:1985.1
Treatment of sec-alkyl phenyl tellurides, except for the cyclohexyl system, with m-chloroperbenzoic acid(MCPBA) in diethyl ether readily afforded the corresponding olefins in good yields presumably via telluroxide elimination together with small amounts of alcohols and ketones. In the pri-alkyl and cyclohexyl cases the adducts between MCPBA and the tellurides were isolated as stable organotellurium(IV)
Phenylselenotris(trimethylsilyl)silane and phenyltellurotris(trimethylsilyl)silane: versatile reagents for the preparation of phenylseleno- and phenyltelluro-formates
作者:Carl H. Schiesser、Melissa A. Skidmore
DOI:10.1039/a704402j
日期:——
Phenyltellurotris(trimethylsilyl)silane 4 and
(4-fluorophenyltelluro)tris(trimethylsilyl)silane 5 react with methyl,
2-methylpropyl, cyclohexyl and phenyl substituted chloroformates (7, 11,
15, 19) in benzene and in the presence of
tetrakis(triphenylphosphine)palladium(0) (4 mol%) to afford the
corresponding aryltelluroformate (8, 9, 12, 13, 16, 17, 20, 21) in
50–79% yield; this procedure is also applicable to the preparation
of (phenylseleno)formates and seleno- and telluro-esters.
Substituent effects and stereochemistry in125Te NMR spectroscopy. Diorganyltellurium dihalides and some tellurides and ditellurides
作者:Helmut Duddeck、Armin Biallaβ
DOI:10.1002/mrc.1260320509
日期:1994.4
125Te, 19F and 13C NMR data for 33 compounds containing tellurium substituents are presented. The 125Te chemical shifts in (PhTeCl2)R compounds are between δ = 878 and 1023; in corresponding (PhTeF2)R compounds they are 220 to 360 ppm larger. Effects of substituents and conformational interconversions (dynamic 125Te NMR) are discussed. Several diastereomers were identified in (PhTeCl2)R derivatives
Reactions of alkylmercurials with heteroatom-centered acceptor radicals
作者:Glen A. Russell、Preecha. Ngoviwatchai、Hasan I. Tashtoush、Anna. Pla-Dalmau、Rajive K. Khanna
DOI:10.1021/ja00219a030
日期:1988.5
En particulier, reactivite relative de chlorures d'alkylmercures vis-a-vis de PhS • , PhSe • et I • generes a partir du disulfure de phenyle, diseleniure de phenyle et du β-iodo styrene ou du (diphenyl-1,1 iodo-2) ethylene
En 特别,反应性相对于 de PhS • , PhSe • et I • 与 de PhS • , PhSe • et I • 属 a partir du disulfure de phenyle, diseleniure de phenyle et du β-iodo 苯乙烯 ou du (diphenyl-1,1 iodo -2) 乙烯
Evaluation of phenylorganotellurium compounds as radical precursors in dialkylzinc-mediated radical addition to CN double bonds
作者:Fabien Cougnon、Laurence Feray、Samantha Bazin、Michèle P. Bertrand
DOI:10.1016/j.tet.2007.09.014
日期:2007.11
Diethylzinc-mediated radical addition to CNbonds was investigated in the presence of phenylorganotellurium compounds as radical precursors. As group transfer agents, secondary alkyl phenyl tellurides were shown to be about twice as reactive as the corresponding alkyl iodides towards ethyl radical. Their use was proven to be advantageous regarding both chemoselectivity and yield. The replacement of