[6-(Diethylamino)-9-[4-[4-(7-hydroxy-2-oxochromene-3-carbonyl)piperazine-1-carbonyl]phenyl]xanthen-3-ylidene]-diethylazanium   、                                                                                      
2,4-二硝基氟苯                                                                                                                                                              在
                                                                                                                                                                                 
caesium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                以64%的产率得到[6-(Diethylamino)-9-[4-[4-[7-(2,4-dinitrophenoxy)-2-oxochromene-3-carbonyl]piperazine-1-carbonyl]phenyl]xanthen-3-ylidene]-diethylazanium