3,4-dichloro-phenyl-hydroxymalonic acid diamide   、                                                                                      
邻氯苯甲酰氯                                                                                                                                                              在
                                                                                                                                                                                 
乙醇                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
吡啶   、                                                                                         
乙酸乙酯                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以13 g of pure 3,4-dichlorophenyl-(2-chlorobenzoyloxy)-malonic acid diamide of melting point 220° C. were obtained的产率得到3,4-dichlorophenyl-(2-chlorobenzoyloxy)-malonic acid diamide