Flowchemicalsynthesis has been fruitfully used for synthesizing cannabidiol (CBD) and itsanalogues cannabidivarin (CBDV) and cannabidibutol (CBDB) in 55 %, 56 %, and 59 % yields respectively. This approach permitted both to synthesize products in very short reaction time (residence time 7 minutes) and minimized the formation of psychoactive and illegal cannabinoids such a tetrahydrocannabinol (THC)
Boron trifluoride etherate on alumina catalyses the condensation of resorcinols an monomethyl resorcinols with several monoterpenoid allylic alcohols: in contrast to parallel reactions with boron trifluoride etherate in solution the products obtained do not undergo further cyclisations.