o-Fluoranil Chemistry: Diels-Alder versus Hetero-Diels-Alder Cycloaddition.

[摘要]：The title quinone undergoes [4 + 2] cycloaddns. in two ways, Diels-Alder on the ring and hetero-Diels-Alder by attack at the oxygens. The latter mode of reaction is strongly favored thermodynamically, but there is a kinetic bias favoring the normal Diels-Alder addn. that often prevails, esp. with cycloaddends that are not electron-rich.

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