cis-3,4-dichlorocyclobutene 、
3,5-Dichloro-2,4,6-trimethyl-benzonitrile N-oxide 以
乙醚 为溶剂,
生成
6t,7t-dichloro-4-(3,5-dichloro-2,4,6-trimethyl-phenyl)-(1rH,5cH)-2-oxa-3-aza-bicyclo[3.2.0]hept-3-ene 、 6
c,7
c-dichloro-4-(3,5-dichloro-2,4,6-trimethyl-phenyl)-(1
rH,5
cH)-2-oxa-3-aza-bicyclo[3.2.0]hept-3-ene