通过铬(II)的还原率,还原电位,电荷转移能和pK R +值测量的取代对甲基yl和环丙烯ium离子的稳定性参数之间的线性自由能关系
摘要:
已经合成了九个对yl离子,并测量了经验稳定性参数(i)-(iv)以及已知的对yl离子和环丙烯鎓离子的参数:(I)Cr(II)离子还原速率常数(k 2) 25.0°的10%盐酸水溶液; (ii)1,在1,2-二氯乙烷中的电荷转移频率(v CT max);(iii)在二氯甲烷或乙腈中的还原峰电位(E red);(iv)在23%的乙醇水溶液,50%的乙醇水溶液和50%的乙腈水溶液中的pK R +值。当检查了这些和先前报告的结果的线性自由能关系(LFER)(a)之间的电荷转移能量{(ECT)},119.5× v CT max(cm -1),kJ mol -1和E red {(96.36×E red(V),kj mol -1)};(b)在log k 2 {(5.70×log k 2(1 mol -1 s -1),kJ mol -1)}与E red之间;(c)在log k 2和E CT之间,发现令人满意的相互关系。
New pathways of site selective aromatic alkylation of palladium complexes: fragmentation to arenes vs. ring closure to hexahydromethano-fluorenes or -phenanthrenes
Catalytic alkylation of arylGrignard reagents by iron(<scp>iii</scp>) amine-bis(phenolate) complexes
作者:Xin Qian、Louise N. Dawe、Christopher M. Kozak
DOI:10.1039/c0dt01239d
日期:——
[FeL2(μ-Cl)]2 (2) and [FeL3(μ-Cl)]2 (3). In the solid state, these complexes exist as chloride-bridged dimers giving distorted trigonal bipyramidal iron(III) ions. Reaction of H2L1 with FeBr3, however, results in the formation of a tetrahedral iron(III) complex possessing two bromide ligands. The amine-bis(phenolate) ligand is bidentate in this complex and bonds to the iron(III) ion via the phenolate O-donors
Versatile Friedel-Crafts-Type Alkylation of Benzene Derivatives Using a Molybdenum Complex/ortho-Chloranil Catalytic System
作者:Yoshihiko Yamamoto、Kouhei Itonaga
DOI:10.1002/chem.200801105
日期:——
molybdenum complexes catalyze Friedel-Crafts-type alkylation reactions of benzene derivatives with alkenes and alcohols in the presence of an organic oxidant, o-chloranil. The utilization of [Mo(CO)(6)] and two equivalents of o-chloranil catalytically furnished the hydroarylation product of norbornene with p-xylene at 80 degrees C, whereas [Cr(CO)(6)] and [W(CO)(6)] failed to catalyze the same reaction, thus
Hydrotalcite-supported palladium nanoparticles as catalysts for the hydroarylation of carbon–carbon multiple bonds
作者:A. Di Nicola、A. Arcadi、K. Gallucci、V. Mucciante、L. Rossi
DOI:10.1039/c7nj04046f
日期:——
alkenes with aryl iodides under air in MeCN. The reaction of tertiary propargylic alcohols (1) with aryl iodides (2) yields, stereoselectively, γ,γ-diarylallylic alcohols (3) in moderate to high yields and high selectivity. Also, the HT/Pd hydroarylation reaction with aryl iodides was attempted on norbornene and α,β-unsaturated ketones affording, respectively, exo-aryl bicyclo[2.2.1]heptanes and β-aryl ketones
[EN] IRON BISPHENOLATE COMPLEXES AND METHODS OF USE AND SYNTHESIS THEREOF<br/>[FR] COMPLEXES BISPHÉNOLATES DE FER ET LEURS PROCÉDÉS D'UTILISATION ET DE SYNTHÈSE
申请人:UNIV PRINCE EDWARD ISLAND
公开号:WO2013053046A1
公开(公告)日:2013-04-18
The present application, relates to iron bisphenolate complexes and methods of use and synthesis thereof. The iron complexes are prepared from tridentate or tetradentate ligands of Formula I: wherein R1 and R2 are as defined herein. Also provided are methods and processes of using the iron bisphenolate complexes as catalysts in cross-coupling reactions and in controlled radical polymerizations.
Novel reactions of low valent titanium and zirconium reagents generated by reduction of Cp2TiCl2 and Cp2ZrCl2 with magnesium and 1,2-dibromoethane
作者:S. Achyutha Rao、M. Periasamy
DOI:10.1016/0022-328x(88)83026-2
日期:1988.9
The reduction of Cp2MCl2 (M = Ti or Zr) with Grignard grade magnesium and 1,2-dibromoethane in THF at 0° C gives the corresponding metallocene-ethylene complexes along with hydride species, as indicated by the reaction with diphenyl-acetylene to give 1,2-diphenyl-(E)-1-butene. The reactions of the Cp2ZrCl2/1,2-dibromobenzene/Mg system in THF with diphenylacetylene and norbornene are also described