toluene-4-sulfonic acid T=100°C; 5 h; other catalysts, variation of condition; Product distribution;
参考文献
Chemistry of Heterocyclic Compounds (New York, NY, United States), , vol. 25, # 12 p. 1338 - 1342
Khimiya Geterotsiklicheskikh Soedinenii, , vol. 25, # 12 p. 1607 - 1611