Pyrrolidine → 1-(4-PHENYLCYCLOHEX-1-ENYL)PYRROLIDINE

Participants

Reaction Conditions

Reaction Steps

36.8 g (0.517 mole) of pyrrolidine dissolved in 170 ml of n-hexane were added dropwise to 30.0 g (0.172 mole) of 4-phenylcyclohexanone dissolved in 860 ml of n-hexane, and the solution was cooled to 0° C. in an ice bath. 18.0 g (0.095 mole) of titanium tetrachloride dissolved in 140 ml of n-hexane were added dropwise within one hour at 0° C.-10° C., stirred for a further two hours at RT, following which the suspension was filtered. The filtrate was concentrated by evaporation on a rotary evaporator (500 to 10 mbar), and the remaining oil was purified by distillation at a pressure of less than 1 mbar; the main fraction boiled at 135° C. 22.2 of crude product were obtained, which on account of incomplete conversion underwent, in the cold, the addition of 27.2 g (0.379 mole) of pyyrolidine dissolved in 125 ml of n-hexane and 13.1 g (0.069 mole) of titanium tetrachloride dissolved in 140 ml of n-hexane, and the mixture was then heated under reflux for two hours. 20.2 g of 1-(4-phenylcyclohex-1-enyl)pyrrolidine (51.7% of theory) were obtained in this way.

Provenance & Evidence