Abstract
The reactions of acetylenic ether (1) with higher order cuprates (2a), (2b) and (2c) were studied chemically and spectroscopically. Conditions were developed to efficiently and regioselectively prepare α- and β-stannylvinyl ethers. 1 H and 13 C NMR studies of these reactions suggest that in the presence of HMPA, higher order stannylcyanocuprate, (Bu 3 Sn) 2 Cu(CN)Li 2 , (2a), exists in equilibrium with Gilman cuprate, (Bu 3 Sn) 2 CuLi
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