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Individual exposure to L-Pro of 1a or 2a gave the corresponding self-[4 + 2]- and self-[3 + 3]-cycloaddition adducts, respectively. However, in the reaction of the mixture of 1a, 2a, and L-Pro, cross-[4 + 2]-cycloaddition was dominant and less than 5% yields of the self-condensation adducts were observed.
-
Individual exposure to L-Pro of 1a or 2a gave the corresponding self-[4 + 2]- and self-[3 + 3]-cycloaddition adducts, respectively. However, in the reaction of the mixture of 1a, 2a, and L-Pro, cross-[4 + 2]-cycloaddition was dominant and less than 5% yields of the self-condensation adducts were observed.
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