1-Phenyl-2-piperidino-aethanol-N-oxid 、
3,3-pentamethylene-5-phenylspiro{(1-oxa-3-azonia-2-boratacyclopentane)-2,2'-(dibenzo{c,f}-1',4',2'-dioxaboratepine)} 以
乙醇 为溶剂,
以75-85的产率得到4,4-pentamethylene-6-phenylspiro{(1,3-dioxa-4-azonia-2-boratacyclohexane)-2,2'-(dibenzo{c,f}-1',4',2'-dioxaboratepine)}