under a nitrogen atmosphere for 3 hr and at ambient temperature for 72 hr the reaction was concentrated on a rotary evaporator to a dark oil the oil was partitioned between 3n hydrochloric acid solution and benzene the acid layer was basified with 50 sodium hydroxide solution and extracted with benzene the extract was dried magnesium sulfate and concentrated to obtain 65 g of light colored oil the oil was distilled first under aspirator vacuum and then under high vacuum 0 25 mm a pure fraction of the title compound distilled at 100 u00b0 105 u00b0 c 15 mm a small sample was converted to the dioxalate salt mp 188 u00b0 190 u00b0 c analysis calculated for c 13 h 24 n 2 o 8 c 46 42 h 7 19 n 8 33 following the procedure of preparation 5 and substituting for 1 t butyl 3 pyrrolidinol the following following the procedure of preparation 8 and substituting for methylamine and 3 bromo 1 cyclohexylpyrrolidinol the following following the procedures of preparation 10 and substituting for t butylamine and 1 t butyl 3 pyrrolidinol the following following the procedures of preparation 2 and substituting the following for n methyl n 1 methyl 3 pyrrolidinyl 1h benzimidazol 2 amine to 3 0 g 0 0103 mol of.