Patent ID: 8258322

Claim:
A process for preparing a 6a,10a-cis-hexahydrodibenzo[b,d]pyran-9-one of the general formula: wherein R 1 is C 5-10 -alkyl, C 5-10 -alkenyl, C 5-8 -cycloalkyl, or C 5-8 -cycloalkenyl, and wherein the hydrogen atoms at the 6a and 10a positions are oriented cis to one another, comprising the step of: (ii) reacting a 5-substituted resorcinol of the formula: wherein R 1 has the same meaning as above, with a 1-alkoxy-4-(1-hydroxy-1-methylethyl)-1,4-cyclohexadiene of the formula: wherein R 2 is C 1-4 -alkyl, in the presence of (a) a Lewis acid said Lewis acid being trifluoromethanesulfonic anhydride (Tf 2 O), trifluoromethanesulfonic acid (TfOH), or sulfuric acid, and (b) an organic solvent.