Synthesis and Structural Characterization of Monophosphine-Cyclopalladated Ferrocenylpyrimidine Complexes and Reusable Catalytic System for Amination of Hindered Aryl Chlorides in PEG-400
作者:Chen Xu、Zhi-Qiang Wang、Wei-Jun Fu、Xin-Hua Lou、Ying-Fei Li、Fei-Fei Cen、Hong-Ji Ma、Bao-Ming Ji
DOI:10.1021/om801149r
日期:2009.3.23
catalytic activity of these air- and moisture-stable palladacycles was evaluated in the Buchwald−Hartwigamination involving a range of sterically hindered arylchlorides. 5 and 6 were found to be very efficient for this reaction. Typically, using 1 mol % of catalyst in the presence of 2 equiv of KtOBu as base in PEG-400 [poly(ethylene glycol-400)] at 120 °C provided coupling products in excellent
一个新的基于二茂铁-配体,4,6-二甲基-2- pyrimidinylferrocene(1),通过chloromercuriferrocene和4,6-二甲基-2-碘嘧啶的偶联反应方便地制备,且其单膦-钯化合物配合物3 - 6分别环钯反应和桥裂反应也很容易获得。这些化合物已通过1 H NMR,13 C 11 H NMR,IR,ESI-MS和元素分析。此外,它们的详细结构已经通过X射线单晶衍射确定,并且发现这些Palladacycles的晶体中存在许多类型的分子内和分子间氢键。这些空气和水分稳定的Palladacycles的催化活性在布赫瓦尔德-哈特维格胺(Buchwald-Hartwig)胺化反应中进行了评估,涉及一系列空间受阻的芳基氯化物。发现5和6对于该反应非常有效。通常,使用1摩尔%的催化剂的在2当量的K的存在吨OBU作为碱在PEG-400 [聚(乙二醇-400)]在120℃下提供偶联产物以优良产率。而且,这6/
Organomercutation of the carbanion derived from [M(CO)4(Ph2PCH2PPh2)] (M Cr, Mo or W). Crystal and molecular structure of [Cr(CO)4∗[Ph2PCH(HgMe)PPh2∗]]
作者:Alan T. Hutton、Francois P. Wewers
DOI:10.1016/0022-328x(95)05431-n
日期:1995.5
The carbanions resulting from the deprotonation by nBuLi of compounds of the type [M(CO)4(Ph2PCH2PPh2)] (M Cr, Mo or W) are readily organomercurated by RHgCl [R e.g. Me, Et, Ph, or (C5H4)Fe(C5H5)] to give neutral complexes of the type [M(CO)4∗[Ph2PCH(HgR)PPh2∗]]. The X-ray crystal structure of the complex with M Cr and R Me has been determined, and reveals intermolecular C ··· O hydrogen bonding
(1) Organomercuric derivatives of barenes react with electrophilic reagents (e.g. hydrogen chloride, bromine, mercuric chloride), if at all only under very vigorous conditions.
X-ray crystalstructure of the complex Et–Hg·TpPh2, which is here reported, represents the first case in which the Hg (bonded to an organic R-group and a tripodal N-donor ligand) is tetrahedrally coordinated (with some distortions), instead of being T-shaped. The compound is orthorhombic, space group P 212121 with a=12.966(3) Å, b=16.940(3) Å, and c=18.412(4) Å; V=4044(1) Å3; Z=4; R(Rw)=0.056(0.057).
Heterometallic Osmium−Mercury Chain Structures Linking Two {Os<sub>3</sub>(CO)<sub>10</sub>(μ-X)} Subunits (X = Cl, Br, I): Syntheses and Molecular Structures of [{Os<sub>3</sub>(CO)<sub>10</sub>(μ-X)}<sub>2</sub>(μ<sub>4</sub>-Hg)] (X = Cl, I), [{Os<sub>3</sub>(CO)<sub>10</sub>(μ-Cl)}<sub>2</sub>{μ-HgOs(CO)<sub>4</sub>}<sub>2</sub>], and <i>cis</i>-[Os(CO)<sub>4</sub>{(μ-Hg)Os<sub>3</sub>(CO)<sub>10</sub>(μ-Cl)}<sub>2</sub>]
作者:Yat-Kun Au、Wing-Tak Wong
DOI:10.1021/ic961092p
日期:1997.5.1
"Hg-Os(CO)(4)}(2)-Hg" molecular backbone with the two Os(CO)(4) fragments arranged in a staggered conformation. Cluster 2a is thermally unstable and converts slowly to cis-[Os(CO)(4)(&mgr;-Hg)Os(3)(CO)(10)(&mgr;-Cl)}(2)] (4a) via the extrusion of an Os(CO)(4) moiety under ambient conditions. Cluster 4a comprises two (&mgr;-Hg)Os(3)(CO)(10)(&mgr;-Cl)} subcluster units bonded to a central Os(CO)(4)