trifluorormethanesulfonic acid in dichloromethane 0.333333 h; ice cooling to r.t.; other ketones;
参考文献
Olah, George A.; Husain, Altaf; Gupta, B. C. Balaram; Salem, George F.; Narang, Subhash C.
Journal of Organic Chemistry, 1981 , vol. 46, p. 5212 - 5214