The incorporation of 2'-bromodidehydro[N-(CH3)-C-14]reticulinium iodide (1)
into (+/-)-12-bromotetrahydropalmatine (J), (+)-12-bromotetrahydropalmatin
e (9) and (-)-12-bromotetrahydropalmatine (7) in Cocculus laurlfolius DC (M
enispermaceae) has been studied and stercospecific reduction of 1 into (+)-
9 and (-)-7 and (+/-)-(J), 12-bromotetrahydropalmltines demonstrated.