1: 57 percent / various solvent(s) / 210 °C 2: 90 percent / phosphorus oxychloride / 3 h / 80 °C 3: 76 percent / polyphosphoric acid / 1 h / 120 - 130 °C 4: 70 percent / sulphur / 0.5 h / 230 °C View Scheme
参考文献
Bhumgara, S. K.; Seshadri, S.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1987 , vol. 26, # 1-12 p. 171 - 172