Chemo- and Regioselective Functionalization of Polyols through Catalytic C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Kumada-Type Coupling of Cyclic Sulfate Esters
作者:Rodrigo Ramírez-Contreras、Bill Morandi
DOI:10.1021/acs.orglett.6b01745
日期:2016.8.5
This contribution describes a copper-catalyzed, C(sp3)–C(sp3) cross-coupling reaction of cyclic sulfate esters, a distinct class of electrophilic derivatives of polyols, with alkyl Grignard reagents to afford functionalized alcohol products in good yields. The method is operationally simple and highlights the potential of cyclic sulfate esters as highly reactive substrates in catalytic, chemoselective
The stereochemistry of metal catalysed hydrogen cyanide addition to alkenes
作者:W.Roy Jackson、Craig G. Lovel
DOI:10.1016/s0040-4039(00)87174-9
日期:1982.1
Reactions of both terminal and cyclic alkenes have been shown to occur in a stereospecifically - manner with deutrerium cyanide when a catalyst system based on Pd(DIOP)2 was used. Reactions of cyclohexene give only the products of equatorial cyanide incorporation.
Mechanistic Aspects of the Reactions of Bis(pentafluorophenyl)borane with the Dialkyl Zirconocenes Cp<sub>2</sub>ZrR<sub>2</sub> (R = CH<sub>3</sub>, CH<sub>2</sub>SiMe<sub>3</sub>, and CH<sub>2</sub>C<sub>6</sub>H<sub>5</sub>)
作者:Rupert E. v. H. Spence、Warren E. Piers、Yimin Sun、Masood Parvez、Leonard R. MacGillivray、Michael J. Zaworotko
DOI:10.1021/om9802313
日期:1998.6.1
scrambling process involving the borane proton and the Cα−H positions of the zirconium alkyl groups (R = CH3, CH2Ph). For example, treatment of Cp2Zr(CD2C6D5)2 with 1 equiv of HB(C6F5)2 leads to a mixture of isotopomers of 4 and toluene, including C6D5CH3 and C6D5CH2D, suggesting a scrambling process in which the borane engages in multiple contacts with the metallocene reagent prior to alkane elimination
Stereochemistry of the nickel-catalysed hydrocyanation of olefins
作者:Jan-E. Bäckvall、Ove S. Andell
DOI:10.1039/c39810001098
日期:——
Nickel-catalysed addition of deuterium cyanide to (E)-1-deuterio-3,3-dimethylbut-1-ene (1) and subsequent analysis of the dideuteriated nitrile (2) by 1H n.m.r. spectroscopy shows that the addition of deuterium and cyanide occurs in a cis-fashion.
镍催化的氰化氘加到(E)-1-氘代的3,3-二甲基丁-1-烯(1)上,随后用1 H nmr光谱分析重标的腈(2)表明,氘和氰化物以顺式存在。
Evidence for concerted extrusion of TeR2 from permethylscandocene tellurolates
作者:Warren E. Piers
DOI:10.1039/c39940000309
日期:——
Use of stereochemical probes shows that both the formation of permethylscandocene tellurolates (via tellurium insertion into Sc–C bonds) and the decomposition of permethylscandocene tellurolates (via extrusion of TeR2) proceed with retention of configuration in the probe, implying concerted transition states for both reactions.