| Abstract: | The irradiation of 1-(dehydroabietoyl) imidazole (3) gave no Type II elimination product but yielded instead compounds 6 and 7 by migration of the imidazolylcarbonyl group from C(4′) to C(6′) of the abietan moiety, probably via a cyclobutanol intermediate. Similarly, irradiation of 1-(13′-deisopropyl-10′-epi-dehydro-abietoyl)imidazole (13) gave only a small amount of Type II fragmentation product 20 , the main products derived from γ-hydrogen abstraction being the cyclobutanol derivatives 16 and 17 . |
