Substitution nucléophile aromatique d'aryllithiumtricarbonylchrome sur des méthoxy- et chloro-arenetricarbonylchrome
摘要:
Treatment of veratroletricarbonylchromium with n-BuLi and ClS(CHMe2)3 or para-chlorotoluenetricarbonylchromium complexes with n-BuLi yields unexpected dinuclear complexes 4 and 6 via a cine nucleophilic aromatic substitution of a methoxy or a chloro group by an aryllithiumtricarbonylchromium complex. The structure of one of these complexes 4 is reported which shows the loss of a methoxy group and a 34-degrees torsional angle between the aromatic rings.
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.
Infrared and proton magnetic resonance spectra of π-complexes of substituted condensed hydrocarbons
作者:David A. Brown、J. R. Raju
DOI:10.1039/j19660001617
日期:——
The infrared and protonmagneticresonancespectra of a series of chromium tricarbonyl complexes of substituted benzenes, biphenyls, and phenanthrenes are discussed.
Catalytic Asymmetric C–H Arylation of (η<sup>6</sup>-Arene)Chromium Complexes: Facile Access to Planar-Chiral Phosphines
作者:María Batuecas、Junfei Luo、Ivana Gergelitsová、Katrina Krämer、Daniel Whitaker、Iñigo J. Vitorica-Yrezabal、Igor Larrosa
DOI:10.1021/acscatal.9b00918
日期:2019.6.7
hemilabile ligand H8-BINAP(O) is key to providing high enantioselectivity in this transformation. We show that this methodology opens the door to the synthesis of a variety of planar-chiral chromium derivatives which can be easily transformed into planar chiral mono- or diphosphines. Mechanistic studies, including synthesis and characterization of Pd and Ag complexes and their detection in the reaction mixture
Nucleophilic substitution reactions of (η6-fluorotoluene)Cr(CO)3 and (η6-fluoroanisole)Cr(CO)3 toward phenylacetylide, fluorenyl, indolinyl and carbazolinyl lithium: crystal structures of tricarbonyl[η6-(1,2-diphenylethynyl)benzene]chromium and tricarbonyl[η6-(1,4-fluorenyl)toluene]chromium
作者:Fung-E Hong、Shih-Chun Lo、Ming-Woei Liou、Lung-Fang Chou、Chu-Chieh Lin
DOI:10.1016/0022-328x(96)06131-1
日期:1996.6
(4c) with lithium phenylacetylide (3). The formation of ortho- and meta-products, 7b, 8a and 7a, produced in the above reaction demonstrates that the reaction was by no means through a straightforward nucleophilic substitution mechanism. These results provided support for the mechanism proposed by Pauson and Brookhart, in which the nucleophile attacked the carbon atom of the phenyl ring not bearing
三羰基[ η 6 - (1,2- diphenylethynyl)苯]铬(8A)与三羰基[沿着得到η 6 - (2-苯基乙炔基)茴香醚]铬(7B)和三羰基[ η 6 - (3-苯基乙炔基)茴香醚]铬(7A从三羰基()的反应η 6 -fluoroanisol)铬(4C)与苯基乙炔锂(3)。原产物和元产物7b,8a和7a的形成在上述反应中产生的α,表明该反应决不是通过直接的亲核取代机理进行的。这些结果为Pauson和Brookhart提出的机理提供了支持,其中亲核试剂攻击不带有离去基团的苯环的碳原子,随后氢迁移并最终消除离去基团以获得芳香性。推测是由7b与过量3的反应获得了8a。用质谱,红外,1 H,13 C NMR谱表征化合物。8a的分子结构已通过X射线衍射研究确定。晶体数据如下:斜方晶系,P BCA,。