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The reaction of other activated alkenes, such as 2-cyano-3-phenylacrylic acid methyl ester or 3-cycanochromone, gave the corresponding cyclopentene products in 20-30% yields under standard conditions.
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The reaction of other activated alkenes, such as 2-cyano-3-phenylacrylic acid methyl ester or 3-cycanochromone, gave the corresponding cyclopentene products in 20-30% yields under standard conditions.
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An alternative reaction mechanism is a [4 + 2] cycloaddition between Pd-carbene and alkene to form, a six-membered cyclic palladium species. Subsequent reductive elimination gives the [3 + 2] cycloaddition product. However, this pathway is less reasonable for the regioselective fromation. of the corresponding cyclopentene product.
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An alternative reaction mechanism is a [4 + 2] cycloaddition between Pd-carbene and alkene to form, a six-membered cyclic palladium species. Subsequent reductive elimination gives the [3 + 2] cycloaddition product. However, this pathway is less reasonable for the regioselective fromation. of the corresponding cyclopentene product.
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