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A solution of 2,2-di-(2-tolyl)-tetrahydrofuran 33a (40 g) in 57% aqueous iodic acid (250 mL) was boiled under reflux for 30 min. The cooled solution was extracted with diethyl ether. The combined organic phases were washed with water and a saturated aqueous solution of NaCl, dried (Na2SO4) and evaporated in vacuo. The residue was subjected to CC (n-heptane/ethyl acetate 15:1) to give the title compound 36a as an oil (44 g). 1H NMR (CDCl3) 67 2.10 (s,3H), 2.30 (s,3H), 2.65 (q,2H), 3.19 (t,2H), 5.73 (t, 1H), 7.05-7.22 (m,8H)

1. temperatureunder reflux for 30 min
2. extractionThe cooled solution was extracted with diethyl ether
3. washThe combined organic phases were washed with water
4. dry with materiala saturated aqueous solution of NaCl, dried (Na2SO4)
5. customevaporated in vacuo