389 mg of α-bromomethyl-2,4-dichlorobenzyl alcohol and 300 mg of 2-(4-fluorophenoxymethyl)-3,4-dihydro-2H-pyran, prepared as described above, were dissolved in 10 ml of diethyl ether. A catalytic amount (2 drops) of phosphorus oxytrichloride was added to the resulting solution and the mixture allowed to react at room temperature for 4 days, after which it was treated and the product purified essentially as described in Example 34(a), to give 214 mg of the isomer of lesser polarity of trans-6-(4-fluorophenoxymethyl)-2-[2-bromo-1-(2,4-dichlorophenyl)ethoxy]tetrahydropyran, 211 mg of the isomer of greater polarity and 143 mg of a mixture of these isomers.
