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