噻吩,2,5-二氯-3,4-二(氯甲基)-   、                                                                                      
三缩四乙二醇                                                                                                                                                              在
                                                                                                                                                                                 sodium hydride                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
18,20-dichloro-3,6,9,12,15-pentaoxa-19-thiabicyclo<15.3.0>eicosa-1(20),17-diene   、                                                                                             18,20,38,40-tetrachloro-3,6,9,12,15,23,26,29,32,35-decaoxa-19,39-dithiatricyclo<35.3.0.0
17,21>tetraconta-1(40),17,20,37-tetraene