2,4-二氯-5-氟苯乙酸   、                                                                                      
草酰氯   、                                                                                      
3-(p-Hydroxy-phenyl)-Δ2-pyrazolin                                                                                                                                                              在
                                                                                                                                                                                 
2-(2,4-dichloro-5-fluoro-phenyl)-1-[3-(4-hydroxy-phenyl)-4,5-dihydro-pyrazol-1-yl]-ethanone                                                                                                                                  作用下,
                                                                                                                                                                                                                            以to give final compound 2-(2,4-dichloro-5-fluoro-phenyl)-1-[3-(4-hydroxy-phenyl)-4,5-dihydro-pyrazol-1-yl]-ethanone (52)的产率得到2-(2,4-dichloro-5-fluoro-phenyl)-1-[3-(4-hydroxy-phenyl)-4,5-dihydro-pyrazol-1-yl]-ethanone