7-[(Z)-3-Dimethylamino-2-(4-nitro-phenyl)-prop-2-en-(E)-ylidene]-2,4-diphenyl-6,7-dihydro-5H-cyclopenta[b]pyranylium; perchlorate                                                                                                                                                              在
                                                                                                                                                                                 
sodium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以45%的产率得到(E)-3-(2,4-Diphenyl-5,6-dihydro-cyclopenta[b]pyran-7-yl)-2-(4-nitro-phenyl)-propenal