(E) 2(dimethylphosphato, dimethylphosphono)methylene-4<(4-oxo-4H-1-benzopyran-2-yl)carbonyloxy>2H-1-benzopyran                                                                                                                                                                                              以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以57.5%的产率得到(Z) 2(dimethylphosphato, dimethylphosphono)methylene-4<(4-oxo-4H-1-benzopyran-2-yl)carbonyloxy>2H-1-benzopyran