in tetrahydrofuran propargylic chloride was added under N2 at -60°C to a soln. of EtCu in THF, mixt. was stirred for 1 h at -60°C; purity of the product >=95percent; mixt. was poured into satd. aq. NH4Cl containing NaCN, extd. with 1:1 ether-pentane, combined exts. were washed with water, dried over MgSO4, solvent was evapd. in vacuo, residue crystd. from methanol or purified by column chromy. (Al2O3, hexane);