'Reaction of 10% excess diene in ethyl ether overnight at room temperature. All products gave satisfactory elemental analyses. Percent yield based on dienophile after recrystallization from boiling heptane. preparation of 2b and 2c. In contrast, Id did not afford the cyclooctane 2d. 6 The reaction could accommodate larger alkyl substituents as demonstrated by preparation of 2e-g. Two further examples indicate the versatility of this ...
