| Abstract: | Lead tetraacetate oxidations of 2,3,3a,4,6,7,7a,8-octahydrobenzo1,2-c:4,5-c']dipyrazolo-3,7-dione and 2,3,3a,4,5,5a,6,7-octahydrobenzo2,1-c:3,4-c']dipyrazolo-3,6-dione in the presence of 1,3-cyclopentadiene, 1,3-cyclohexadiene, 2,3-dimethyl-1,3-butadiene or 1,4-diphenyl-1,3-butadiene have yielded octahydrodipyridazino1,2-a:1,2-a']benzo1,2-c:4,5-c']dipyrazolo-6,14-diones and octahydrodipyridazino1,2-a:1,2-a']benzo2,1-c:3,4-c']dipyrazolo-6,9-diones. In one of the eight Diels-Alder reactions two isomeric products were isolated. |
