in hexane refluxing more days; filtration, a few evaporation; chromy.(silica gel) at -5 °C(eluent: pentane); and cooling to -79 °C;
参考文献
Fischer, E. O.; Richter, K.
Chemische Berichte, 1976 , vol. 109, p. 1140 - 1157
Full Text Show Details
Gmelin Handbook: Bi: Org.Verb., 3.2.2.2, page 147 - 150
