Normal, neutral, and inverse-type Diels–Alder reactions can be observed in [4+2] cycloadditions of thio- and selenocarbonyl compounds 1–9 with various cyclic and aryl-, methyl- or methoxy-substituted open-chain 1,3-butadienes. Extensive kinetic studies prove the highly dienophilic activity of the CS and CSe double bond. Studies of the solvent and temperature dependence of the reaction rate indicate a concerted mechanism.
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Rohr et al. (1998) studied this question.
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