1: 85percent orthophosphoric acid / petroleum ether / 24 h / 35 - 40 °C
2: 75 percent / SnCl2*2H2O/conc.HCl / ethanol / 6 h / Heating
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参考文献
Ahluwalia, V. K.; Singh, Raj P.; Singh, Rishi P.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1987 , vol. 26, # 1-12 p. 287 - 289