in methanol byproducts: C6H5CH((CH3)2C3HN2)2; soln. was stirred at room temp. for 18 h under N2; ppt. filtered off, washed with methanol, filtrate evapd. washed with hexane;

HCl in methanol byproducts: 3,5-dimethylpyrazole hydrochloride; soln. of Rh-complex was frozen by liquid N2, anhydous HCl was added, warmed to room temp.; ppt. filtered off, washed with methanol;