Results Synthesis of Cage Compounds 4 and 5. The insecticide “Isodrin”(3, n= 1) is made by'the Diels-Alder reaction of cyclopentadiene (2, n= 1) with hexachloronorbornadiene (1); 2b homoisodrin (3, n= 2) and bishomoisodrin (3, n= 3) were prepared in good yields by similar reactions of 1, 3-cyclohexadiene (2, n= 2) and 1, 3-cycloheptadiene (2, 71= 3). Ultraviolet irradiation of the Isodrin homologues in acetone3i6 gave the hexachloro cage
