in toluene byproducts: Hg; stirred for 24 h under Ar; filtered, stirred in CH2Cl2, filtered, concd., pptd. (Et2O), filtered, air-dried; also the filtrate concd., pptd. (Et2O), filtered off, washed (Et2O0, air-dried; obtained as a mixt.;

in toluene byproducts: Hg; stirred for 24 h under Ar; filtered, stirred in CH2Cl2, filtered, concd., pptd. (Et2O), filtered, air-dried; also the filtrate concd., pptd. (Et2O), filtered off, washed (Et2O0, air-dried; obtained as a mixt.;

in toluene byproducts: Hg; stirred for 24 h under Ar; filtered, stirred in CH2Cl2, filtered, concd., pptd. (Et2O), filtered, air-dried; also the filtrate concd., pptd. (Et2O), filtered off, washed (Et2O0, air-dried; obtained as a mixt.;

pyridine

in nitrobenzene