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B3LYP/6-31G ∗ calculations were done on a series of [c]-annelated carbo- and heterocyclic five-membered dienes and their cycloaddition transition state structures and products with acetylene as dienophile. While the reactions of cyclobutano[c]- and cyclobuteno[c]- fused five membered rings are to be categorized as traditional [4+2] cycloadditions, those of benzo[c]-fused five-membered rings...
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