toluene-4-sulfonic acid in toluene
16 h; RefluxDean-Stark apparatus;
参考文献
Perry, Matthew A.; Morin, Matthew D.; Slafer, Brian W.; Wolckenhauer, Scott A.; Rychnovsky, Scott D.
Journal of the American Chemical Society, 2010 , vol. 132, # 28 p. 9591 - 9593