Photoinitiation of Acrylate Polymerization with (Arene)chromium Complexes
作者:E. Peter Kündig、Long‐He Xu、Mikhail Kondratenko、Allan F. Cunningham、Martin Kunz
DOI:10.1002/ejic.200700115
日期:2007.6
Photoinitiation of acrylate polymerization by [Cr(eta6-arene)(CO)3] complexes in the presence of an organic chloro compound was investigated. For the bimolecular system, a good correlation between activity and metal-arene and metal-carbonyl bond strength was observed. The highest efficiency was found for an initiator in which the organic chloro compound was tethered to the complexed arene: [Cr(eta
Accelerated Arene Ligand Exchange in the (Arene)Cr(CO)<sub>2</sub>L Series
作者:M. F. Semmelhack、Anatoly Chlenov、Douglas M. Ho
DOI:10.1021/ja042705x
日期:2005.6.1
(eta(6)-arene)Cr(CO)(2)L series can be accelerated if the ligand L is an electronically unsymmetricalbidentate ligand. The system evaluated here employs derivatives of tris(pyrrolyl)phosphine as L. A series of 2-L'-substituted pyrroles was prepared, where the substituents include: L' = -SMe, -CH(2)SMe, -SPh, -CH(2)SPh, -SCF(3), -S-tBu, -CO(2)Me, -CONMe(2), -2-pyridinyl, and -PPh(2). Reaction with ClP(pyrrolyl)(2)
如果配体 L 是电子不对称的双齿配体,则可以加速 (eta(6)-芳烃)Cr(CO)(2)L 系列中的芳烃配体交换。此处评估的系统采用三(吡咯基)膦的衍生物作为 L。制备了一系列 2-L'-取代的吡咯,其中取代基包括:L' = -SMe、-CH(2)SMe、-SPh、- CH(2)SPh、-SCF(3)、-S-tBu、-CO(2)Me、-CONMe(2)、-2-吡啶基和-PPh(2)。与 ClP(pyrrolyl)(2) 反应得到一系列新的膦,(2-L'-pyrrolyl)(pyrrolyl)(2)P。这些膦中的每一种都转化为(芳烃)Cr(CO)(2)[P(2-L'-吡咯基)(吡咯基)(2)P)配合物。建议取代基 L' 为 Cr 提供临时配位并降低芳烃交换的障碍。该系列被评估,其中配合物(离开)中的芳烃是苯、氟苯、甲苯、邻二甲苯、间二甲苯或对二甲苯,进入的芳烃为 C(6)D(6)、氯苯-d
Reactivity of Metallophosphide Anions with Electrophilic (Arene)tricarbonylmetal Complexes
作者:Virginie Comte、Jean Philippe Tranchier、Françoise Rose‐Munch、Eric Rose、Danièle Perrey、Philippe Richard、Claude Moïse
DOI:10.1002/ejic.200200531
日期:2003.5
Reaction of metallophosphideanions [(CO)xM′PPh2]− (M′ = Cr, Fe) with neutral tricarbonyl(η6-fluoroarene)chromium and cationic (η6-arene)tricarbonylmanganese complexes give rise to the formation of dinuclear complexes. These complexes are obtained either by substitution of the fluoride anion in the (arene)chromium complexes, or by addition to the ring in the (arene)manganese complexes. The X-ray structure
Palladium catalysed cross-coupling of (fluoroarene)tricarbonylchromium(0) complexes
作者:René Wilhelm、David A. Widdowson
DOI:10.1039/b006576p
日期:——
(Fluoroarene)tricarbonylchromium(0) complexes were found to undergo Suzuki and Stille cross-coupling reactions to form functionalised biaryl and styrene complexes in up to 87 and 52% yields, respectively. The Suzuki reactions were optimal with dipalladium tris(dibenzylideneacetone)–trimethylphosphine–caesium carbonate in DME at reflux. The Stille reactions were optimal with dipalladium tris(dibenzylideneacetone)–trimethylphosphine–caesium fluoride in DME at reflux and neither was adversely affected by a methoxy group on the complexed ring. The Suzuki reaction tolerated a chloro group on the arylboronic acid ring but not a bromo group.
Heterobimetallic Complexes with Phenylcyclopentadienyl Ligand: Syntheses and Structures of Tricarbonylchromium−η<sup>6</sup>,η<sup>5</sup>-Phenylcyclopentadienyl−Transition Metal Complexes<sup>1</sup>
two pi systems of phenyl and cyclopentadienyl rings were weak. X-ray crystalstructures of seven complexes were studied. Compound 23, [eta(6)-C(6)H(5)Cr(CO)(3)](2)C(10)H(10), crystallizes in orthorhombic space group Pbca with cell constants a = 29.616(8) Å, b = 12.861(5) Å, c = 12.397(7) Å, V = 4721(6) Å(3), Z = 8, R = 0.045, and R(w) = 0.045. Compound 3, (eta(6)-C(6)H(5)C(9)H(7))Cr(CO)(3), crystallizes