NOTES J. OTg. Chem.," 01. 38, No. 26, 1973 4465 limed M g (43.7 g, 1.80 mol) and 200 ml of purified EtzO under argon were stirred while 348 g (1.46 mol) of 3b in 800 ml of purified Et& was added at such a rate as to maintain reflux. The solution was stirred for 30 min after