water; potassium bromide in water byproducts: CH3COOH; reactn. of alkene with a suspn. of Hg(OAc)2 in water, stirring for 45 min, extn. with CH2Cl2, anion exchange with aq. KBr (stirring for 30 min); extn. with CH2Cl2, drying over MgSO4, removal of solvent (rotary evaporator), yields crude, column chromy. on silica gel;

dihydrogen peroxide; potassium bromide in water byproducts: CH3COOH; reactn. of alkene with a suspn. of Hg(OAc)2 in aq. H2O2, stirring for 45 min, extn. with CH2Cl2, anion exchange with aq. KBr (stirring for 30 min); extn. with CH2Cl2, solns. are dried over MgSO4, removal of solvent (rotary evaporator), yields crude (94percent);

(i) PhLi, Li, THF, (ii) /BRN= 1900390/, (iii) /BRN= 102415/; Multistep reaction;