Normal, neutral, and inverse-type Diels-Alder reactions can Extensive kinetic studies prove the highly dienophilic activity of the C=S and C=Se double bond. Studies of the be observed in [4+2] cycloadditions of thio-and selenocarbonyl compounds 1-9 with various cyclic and aryl-, solvent and temperature dependence of the reaction rate indicate a concerted mechanism. methyl-or methoxy-substituted open-chain 1,3-butadienes.
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.
[4+2] Cycloadditions of thiobenzophenones 1a and thiofluorenones 2 with cyclic and open‐chain dienes gave cycloadducts in high yields. Assignment of the product structure especially the regiochemistry of the cycloadditions involved 1H‐ and 13C‐NMR spectroscopy, and single‐crystal structure determination.
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