anhydride, and then the acetylated product was subjected to fractional distillation in
vacuo. The important fractions were passed over a silica gel column in benzene and
then passed over activated alumina in carbon tetrachloride solution. The product
Fig. 7.3 Cannabinoids other thanΔ^9 -THC-type ( 41 – 60 )
7 Natural Cannabinoids of Cannabis and Methods of Analysis 169