Atom-Economic, Metal- and Halogen-Free Synthesis of Podands: α,ω-Diphosphines and Their Chalcogenides Separated by Alkane Diol Spacers
摘要:
Secondary phosphines and phosphine chalcogenides add to the divinyl ether of alpha,omega-alkane diols regio- and chemoselectively under free-radical conditions (UV irradiation or AIBN, 2:1 reactants molar ratio) to give anti-Markovnikov diadducts in good to excellent yields (65-98%).
Diiron Oxadithiolate Type Models for the Active Site of Iron-Only Hydrogenases and Biomimetic Hydrogen Evolution Catalyzed by Fe<sub>2</sub>(<i>μ</i>-SCH<sub>2</sub>OCH<sub>2</sub>S-<i>μ</i>)(CO)<sub>6</sub>
作者:Li-Cheng Song、Zhi-Yong Yang、Hong-Zhu Bian、Yang Liu、Hu-Ting Wang、Xu-Feng Liu、Qing-Mei Hu
DOI:10.1021/om0507373
日期:2005.12.1
The biomimetic chemistry of single and double oxadithiolatodiiron-containing model compounds for the activesite of Fe-only hydrogenases (FeHases) has been systematically studied. The simplest such model, Fe2(μ-SCH2OCH2S-μ)(CO)6 (1), was prepared by reaction of (μ-S2)Fe2(CO)6 with 2 equiv of Et3BHLi followed by direct treatment with excess (ClCH2)2O or by successive treatment with 2 equiv of CF3CO2H
dibenzylideneacetone) and monophosphanes in a 1:1:2 molar ratio to give the corresponding Pd monophosphane fullerene derivatives [Pd(η2-C60)L2] [L = P(2-Fu)3 (Fu = furyl) 1; L = P(2-Fu)Ph22; L = PPh2H 3; L = P(Fc)Ph2 (Fc = ferrocenyl) 4; L = P(Fc)2Ph 5], whereas reaction with M(dba)2 (M = Pd, Pt) and subsequent treatment with diphosphanes in 1:1:1 molar ratio afforded the corresponding Pd/Pt diphosphane fullerene
-rhenium(V) complexes of general formula [MNCl2L][M = Tc or Re; L = bis(diphenylphosphinoethyl)propylamine (L1), 1,8-bis(diphenylphosphino)-3,6-dioxaoctane (L2) or 1,1,1-tris(diphenylphosphinomethyl)ethane (L3)] have been synthesized and characterized. They were prepared by the reduction of [TcVINCl4]– or by the replacement of the two triphenylphosphines of [MNCl2(PPh3)2](M = Re or Tc) by bidentate
A comparison of the ligating properties of the mixed P/O- and P/S-donor ligands Ph2P(CH2)2O(CH2)2O(CH2)2PPh2 and Ph2P(CH2)2S(CH2)2S(CH2)2PPh2 with Group 6 and 7 carbonyls
作者:Bjorn Heuer、Melissa L Matthews、Gillian Reid、Mark Ripley
DOI:10.1016/s0022-328x(02)01413-4
日期:2002.8
[M(CO)4(nbd)] (M=Cr or Mo) react with L1 (Ph2P(CH2)2O(CH2)2O(CH2)2PPh2) to give the trans-[Cr(CO)4(L1)] and cis-[Mo(CO)4(L1)] respectively, both of which show coordination of L1 through the P atoms only, giving 11-membered ring metallocyclic complexes. The crystal structure of [Mo(CO)4(L1)] confirms the cis-geometry of the product. The cis-[W(CO)4(L1)] is obtained similarly from [W(CO)4(TMPA)]. Prolonged
Synthesis of α,ω-bis(diphenylphosphino)alkane and α,ω-bis(diphenylphosphino)(poly)ether ligands and complexes of rhodium(I)
作者:D.Harry M.W. Thewissen、Klaas Timmer、Jan G. Noltes、Jan W. Marsman、Richard M. Laine
DOI:10.1016/s0020-1693(00)86576-7
日期:1985.2
α,ω-Bis(diphenylphosphino)alkane and α,ω-bis(diphenylphosphino)(poly)ether ligands can be prepared in very high yields via reaction of the appropriate dihalide with two equivalents of LiPPh2. For the [Rh(COD)(P P)][ClO4] complexes of these ligands, the P P ligands with five or less atoms in the alkane or ether bridge form monomeric complexes via η2-coordination. In general the ligands with eight or