6-phenyl-4,4-tetramethylenespiro{(1,3-dioxa-4-azonia-2-boratacyclohexane)-2,1'-(4',5'-dihydrodibenzo{b,f}boratepin)}                                                                                                                                                                                              以
                                                                                         xylene                                                                                  为溶剂,
                                                                                                                                                                                        以70%的产率得到5-phenyl-3,3-tetramethylenespiro{(1-oxa-3-azonia-2-boratacyclopentane)-2,2'-(5',6'-dihydrodibenzo{c,g}-1,2-oxaboratocine)}