in chloroform-d1 the Pb-compd. is stirred in dry CDCl3 at 60°C for 13.5 h; the ppt. is allowed to settle and analysis of the supernatant soln. by 1H.NMR, the crude product is filtered through silica gel in ethyl acetate-light petroleum, the resulting oil is fractionated by preperative HPLC, elution with AcOEt-light petroleum;
参考文献
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), , # 14 p. 1677 - 1682
