in tetrahydrofuran; diethyl ether; benzene N2; MeLi in ether added to diene in THF at -78°C, after 2 min MgBr2*OEt2 in ether/benzene; poured into Ph2S2 in THF at -78°C; bath removed; stirred for 2.25 h;; poured into NaOH and ether/pentane; organic layer washed with water and brine; filtered through Na2SO4; radical inhibitor added; solvent removed; preparative TLC (50/1 pentane/ether);;