121340-54-3Relevant academic research and scientific papers
Synthesis, characterization, and the role of counterion in cyclopropanation of styrene catalyzed by [CuI(2,2′-bpy)(π-CH2{double bond, long}CHC6H5)][A] (A = ClO4-, PF6- and CF3 SO3-) complexes
Ricardo, Carolynne,Pintauer, Tomislav
, p. 5165 - 5172 (2007)
Copper(I)/2,2′-bipyridine complexes, [CuI(bpy)(π-CH2CHC6H5)][A] (A = CF3 SO3- (1), PF6- (2)) have been synthesized and characterized. The equilibrium constants for the coordination of styrene to [CuI(bpy)]+ cations at 300 K were determined to be 4.3 × 103 (1), 4.4 × 103 (2) and 3.8 × 103 M-1(A = ClO4-, 3) . These data suggested that the axial coordination of the counterion in these complexes observed in the solid state (2.4297(11) A? 1, 2.9846(12) A? 2, and 2.591(4) A? 3) did not significantly affect the binding constant of styrene to [CuI(bpy)]+ cations in solution. In cyclopropanation reactions catalyzed by 1-3, similar product distribution was obtained. The rate of decomposition of EDA in the presence of styrene at room temperature catalyzed by 3 (kobs = (7.7 ± 0.32) × 10-3 min-1) was slower than the rate observed for 1 (kobs = (1.4 ± 0.041) × 10-2 min-1) or 2 (kobs = (1.0 ± 0.025) × 10-2 min-1).
Synthesis and Structural Study of (2,2'-Bipyridine)perchlorato(styrene)-copper(I)
Masuda, Hideki,Machida, Katsunosuke,Munakata, Megumu,Kitagawa, Susuma,Shimono, Hisao
, p. 1907 - 1910 (2007/10/02)
The reduction of Cu(ClO4)2*6H2O with copper wire in the presence of styrene and 2,2'-bipyridine (bipy) gave the complex I(bipy)(CH2=CHPh)(ClO4)> in methanol.The complex has been characterized by spectroscopic and X-ray diffraction studies.Crystals of the complex are monoclinic, space group P21/n, with a = 12.154(3), b = 14.796(4), c = 10.361(2) Angstroem, β = 111.04(2) degree, and Z = 4.The geometry about the copper(I) atom is trigonal pyramidal, involving two nitrogen atoms of bipy and two carbon atoms of the olefinic moiety of styrene at equatorial positions in an approximately planar fashion and weak co-ordination to an oxygen atom of the perchlorate anion at the axial position.The olefinic C=C bond distance of the co-ordinated styrene molecule, 1.358(10) Angstroem, is slightly longer than those reported for other free olefin molecules.This slight lengthening is reflected in the 1H n.m.r. spectrum of the olefinic protons and the C=C stretching frequency of the co-ordinated styrene in the Raman spectrum and suggests the importance of d?(metal) --> ?*(styrene) back donation in the copper(I)-olefin bonding.
