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‐Selective Chlorocarbamoylation of Alkynes Enabled by a Palladium/Phosphaadamantane Catalyst
作者:Christine M. Le、Xiao Hou、Theresa Sperger、Franziska Schoenebeck、Mark Lautens
DOI:10.1002/anie.201507883
日期:2015.12.21
synthesized by a palladium(0)‐catalyzed intramolecular chlorocarbamoylation reaction of alkynes. A relatively underexplored class of caged phosphine ligands is uniquely suited for this transformation, enabling high levels of reactivity and exquisite transselectivity. This report entails the first transition‐metal‐catalyzed atom‐economic addition of a carbamoyl chloride across an alkyne.
Phenylphosphatrioxa-adamantanes: bulky, robust, electron-poor ligands that give very efficient rhodium(i) hydroformylation catalysts
作者:R. Angharad Baber、Matthew L. Clarke、Katie M. Heslop、Andrew C. Marr、A. Guy Orpen、Paul G. Pringle、Andrew Ward、Damaris E. Zambrano-Williams
DOI:10.1039/b418259f
日期:——
[PtCl(2)(cod)], equilibrium mixtures of trans-[PtCl(2)L(2)] and [Pt(2)Cl(4)L(2)](L = or ) are formed in CH(2)Cl(2) solution. Meso/rac mixtures of trans-[MCl(CO)(1a)(2)] M = Ir (6a) or Rh (7a) are formed upon treatment of MCl(3).nH(2)O with an excess of 1a and the anionic cobalt complex [NHEt(3)][CoCl(3)(1a)](9) was isolated from the product formed by CoCl(2).6H(2)O and 1a. The nu(CO) values from the
笼型膦1,3,5,7-四甲基-6-苯基-2,4,8-三氧杂-6-磷金刚烷(1a)和1,3,5,7-四乙基-6-苯基-2,4,通过酸催化将PhPH(2)添加到适当的β-二酮中来制备8,trioxa-6-phosphaaaadamantane(1b); 使用的酸(HCl,H(3)PO(4)或H(2)SO(4))及其浓度会影响这些缩合反应的速率和选择性。膦1a和1b与[PdCl(2)(NCPh)(2)]反应形成复合物trans- [PdCl(2)(1a)(2)](2a)和trans- [PdCl(2)(1b)( 2)](2b)为rac和内消旋非对映异构体的混合物。铂(II)的化学反应更为复杂,当将1a或1b添加到[PtCl(2)(cod)]中时,反式[PtCl(2)L(2)]和[Pt(2)Cl(在CH(2)Cl(2)溶液中形成4)L(2)](L =或)。反式-[MCl(CO)(1a)(2)] M