in ethanol
70°C; several recrystallization from n-heptane and/or benzene;
参考文献
Redondo, M. I.; Garcia, M. V.; Gonzalez-Tejera, M. J.; Cheda, J. A. R.
Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 1995 , vol. 51, # 3 p. 341 - 348