in methanol 0.5 h; Heating / reflux;

triphenylphosphine in dichloromethane stoich. amts. Ph3P and CuBr mixed in small volume methylene chloride; pentane, hexane or cyclohexane added until ppt. began to form, soln. cooled in ice bath and allowed to stand for a few minutes and filtered;

in chloroform pptd. from CHCl3 soln. of stoich. amt. of CuBr and PPh3; according to P.F. Barron et al., J. Chem. Soc., Dalton Trans., 1987, 1099 and G. Costa , E. Reisenhofer and L. Stefani, J. Inorg. Nucl. Chem., 1965, 27, 2581;

in chloroform T=20°C; 0.5 h;