Published on 01 January 1985. Downloaded by google on 07/05/2016 20:46:06. ... View Article Online / Journal Homepage / Table of Contents for this issue ... I I OR (15) R SiBu'Me R = H (1) 'k (16) ... 6SiBu' Me, (13) Scheme 1. Reagents and conditions (THF = tetrahydofuran; DMF = dimethylformamide): a, ButMezSiCI (1.1 equiv.), imidazole (1.1 equiv.), DMF, 0 + 25 "C, 95%; b, EtMgBr (1.1 equiv., 0.5 M in THF), THF, 0 + 50 "C, then CuBr (0.04 equiv.), 0 + 25 ...