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Probably this result may be attributed to the difference in stability of the radical anion intermediate. A benzyl radical anion intermediate from 1,1-dicyanoalkene derived from aromatic aldehyde or ketone is stabilized by the neighboring aromatic ring, so that it is easy to form and has enough time to react with another one to form dianion and eventually to give product 5 and 6. The less stable radical anion intermediate from 4 derived from an aliphatic aldehyde or ketone is difficult to form, so that the starting material was recovered
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19. Probably this result may be attributed to the difference in stability of the radical anion intermediate. A benzyl radical anion intermediate from 1,1-dicyanoalkene derived from aromatic aldehyde or ketone is stabilized by the neighboring aromatic ring, so that it is easy to form and has enough time to react with another one to form dianion and eventually to give product 5 and 6. The less stable radical anion intermediate from 4 derived from an aliphatic aldehyde or ketone is difficult to form, so that the starting material was recovered.
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