占吨酮   、                                                                                      
2-[2-[Diethoxy(oxido)phosphaniumyl]-[1,3]dithiolo[4,5-d][1,3]dithiol-5-ylidene]-5,6-dihydro-[1,3]dithiolo[4,5-b][1,4]dithiine                                                                                                                                                              在
                                                                                                                                                                                 
lithium diisopropyl amide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以18%的产率得到9-[5-(5,6-Dihydro-[1,3]dithiolo[4,5-b][1,4]dithiin-2-ylidene)-[1,3]dithiolo[4,5-d][1,3]dithiol-2-ylidene]xanthene