摘要:
The reaction of dimethylaminomethylenemalonaldehyde with Grignard reagents, which proceeds through 1,4-addition and is accompanied by the loss of the dimethylamino group, gives previously unreported (2,2-diformylethenyl)cycloalkanes and alpha,omega-bis-(2,2-diformylethenyl)alkanes, which were characterized as dihydropyran [4 + 2]-cycloadducts with vinyl ethyl ether.