three portions of methylene chloride dried mgso 4 and evaporated preparative tlc of the residue on silica gel using methylene chloride methanol 90 10 v v yielded 25 mg 33 of the compound of formula aa the structure was confirmed by n m r and mass spec preparative example 11 str52 3 methylcyclopentene 100 g hgcl 2 330 g nano 2 145 g and water 2 5 l were combined in a flask and stirred at room temperature for 24 hrs at the end of this time the solids which had formed were filtered suspended in methylene chloride and treated with 310 ml of 2 5 n naoh the resulting emulsion was poured through celite and the organic phase of the filtrate separated dried over na 2 so 4 and solvent removed to give an oily solid the product was distilled from this material at 60 u00b0 650 u00b0 at 2mm hg to give a yellow liquid product of formula ab 45 g preparative example 12 str53 a solution of 3 bromoanisole 1 0 g in 5 ml of dry tetrahydrofuran thf was added dropwise to a mixture of magnesium turnings 130 mg in dry thf 3 ml the reaction was allowed to proceed until the magnesium had been consumed the resulting mixture was then cooled to 10 u00b0 c and a solution of the product of formula ab of preparative example 11 567 mg in 5 ml.