Formation and structural features of novel cage compounds with a pentacyclo[6.4.0.03,7.04,11.05,10]dodecane skeleton via photolysis of [33](1,3,5)cyclophane

The photolysis of [3 3 ](1,3,5)cyclophane 8 in MeOH:2N HCl (17:1 v/v) afforded new polycyclic caged dimethoxy and methoxy–hydroxy compounds 12 and 13 with a novel pentacyclo[6.4.0.0 3,7 .0 4,11 .0 5,10 ]dodecane skeleton 7 , in addition to methyl ether 9c with the previously reported skeleton 6 . The unique structural features of 12 and 13 were elucidated by X-ray structural analysis.