in dichloromethane; toluene (N2); imdazole was added to soln. of ReBr(CO)5 in toluene, refluxed for 30 min, evapd. in vac., dissolved in CH2Cl2, AgOTf was added, stirred inthe dark for 1 h, filtered through celite, NaBAr'4 and pyridine were ad ded, stirred for 1 h; filtered, concd., precipitated with hexane, washed with hexane, elem. anal.;
