Abstract
The reaction of the non-symmetric phosphorus ylides,
Ph2P(CH2)(n)PPh2C(H)C(O)PhR with CuCl in equimolar ratios using dry
methanol as solvent give binuclear complexes of the type
Cu(mu-Cl)\Ph2P(CH2)(n)PPh2C(H)C(O)PhR\(2) (n = 1: R = Br (1), OCH3
(2); n = 2: R = Br (3), OCH3 (4)). X-ray analyses of 1 demonstrate the
Cl bridged dimeric structures with P,C-chelated ligands.
Characterizations of these compounds were carried out by FT-IR and
multinuclear NMR technique. Elemental analysis indicate a 1:1
stoichiometry between the ylides and the Cu(I) chloride in the four
complexes. The precursor complexes 1 and 3 are found to exhibit high
catalytic activity in the Cu-catalyzed Suzuki cross-coupling reactions
in an air atmosphere at medium catalyst loading in DMF as a solvent. The
use of 5 mol\% catalyst in the presence of Cs2CO3 allows the coupling
reaction to proceed with moderate to excellent yields. (C) 2013 Elsevier
B.V. All rights reserved.
Users
Please
log in to take part in the discussion (add own reviews or comments).