2,3,7,7a-tetrahydro-7,7-dimethyl-2(p-nitrophenyl)-7a-<2-(p-nitrophenyl)ethenyl>-6-phenylpyrazolo<5,1-b>oxazole 在
tetrafluoroboric acid 作用下,
以
二氯甲烷 为溶剂,
以78%的产率得到1-<2-hydroxy-2-(p-nitrophenyl)ethyl>-4,4-dimethyl-5-<2-(p-nitrophenyl)ethenyl>-3-phenyl-4H-pyrazolium tetrafluoroborate