Reactivity of allylic and vinylic silanes, germanes, stannanes and plumbanes toward SH2′ or SH2 substitution by carbon- or heteroatom-centered free radicals
作者:James P. Light、Michael Ridenour、Lois Beard、James W. Hershberger
DOI:10.1016/0022-328x(87)80119-5
日期:1987.5
E-PhCHCHMR3 (M Si, Ge, Sn, Pb) were allowed to react with a series of heteroatom-centered radicals (PhY ·, Y = S, Se, Te, derived from PhYYPh) and carbon-centered radicals ((CH3)2CH · derived from (CH3)2CHHgCl). We report that alkenylplumbanes and, under forcing conditions, alkenylgermanes undergo SH2 or SH2′ substitution of the metal by chain mechanism analogous to those previously reported for alkenylstannanes
类型CH的化合物2 CHCH 2 MR 3和ë -PhCHCHMR 3(M硅,锗,锡,铅)被允许与一系列杂原子中心自由基(PHY·,Y = S,硒的反应,Te(源自PhYYPh)和碳中心自由基((CH 3)2 CH·源自(CH 3)2 CHHgCl)。我们报告说,烯基铅烷和在强迫条件下,烯基锗烷通过类似于先前针对烯基锡烷所报道的链机理经历了金属的S H 2或S H 2'取代。烯基硅烷是不反应的。
Transformation of β-chalcogeno alkenylboranes into tetrasubstituted olefins
作者:Julien Gerard、László Hevesi
DOI:10.1016/j.tet.2003.11.023
日期:2004.1
In view of generating trisubstituted vinylic chalcogen derivatives, β-chalcogeno alkenylboranes generated through the chalcogen electrophile induced rearrangements of 1-alkynyltrialkyl borates have been subjected to Suzuki–Miyaura coupling and to boron to copper transmetalation followed by alkylation. Some of the trisubstituted vinyl sulfides obtained by this latter strategy have been converted efficiently
A new, practical synthesis of organotellurium compounds from organic halides and silyl tellurides. Remarkable effects of polar solvents and leaving groups
作者:Shigeru Yamago、Kazunori Iida、Jun-ichi Yoshida
DOI:10.1016/s0040-4039(01)00931-5
日期:2001.7
Silyl tellurides react with organichalides to give the corresponding organotellurium compounds and silyl halides in good to excellent yields. Substitution proceeds in polarsolvents, such as acetonitrile, but not in nonpolar solvents under identical conditions. The leaving group also plays a significant role, with alkyl bromides being the most reactive, alkyl chlorides less so and alkyl iodides the
Experimental and theoretical studies on formal σ-bond metathesis of silyl tellurides with alkyl halides
作者:Shigeru Yamago、Kazunori Iida、Jun-ichi Yoshida
DOI:10.1016/j.jorganchem.2006.05.066
日期:2007.1
Silyl tellurides reacted with alkylhalides under mild thermal conditions to give the corresponding alkyl tellurides and silylhalides in good to excellent yields. Substitution took place much faster in polar solvents, such as acetonitrile, than that in non-polarsolvents. After removal of the volatile silyl halides and solvent under vacuum, the essentially pure divalent organotellurium compounds were
Isomerization processes in the synthesis of asymmetric allyl chalcogenides
作者:E. N. Deryagina、N. A. Korchevin
DOI:10.1007/bf01433766
日期:1996.1
Allyl-propenyl rearrangement (prototropic isomerization) occurs in the synthesis of allyl organyl chalcogenides in a hydrazine hydrate-KOH system with a 6–10-fold molar excess of KOH. Specificities of the rearrangement that depend on the nature of the chalcogen were studied.