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- KCN K+ R KOH + H2O
- KCN K+ R KOH + H2O

... Note that the alkene product must contain at least one hydrogen; another way to make C–C bond! In the most general scheme of this reaction, an alkyl halide (usually the bromide) and an aldehyde or ketone are taken to an alkene. In a more detailed picture of this reaction, the alkyl bromide is allowe ...
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Diels–Alder reaction



The Diels–Alder reaction is an organic chemical reaction (specifically, a [4+2] cycloaddition) between a conjugated diene and a substituted alkene, commonly termed the dienophile, to form a substituted cyclohexene system. It was first described by Otto Paul Hermann Diels and Kurt Alder in 1928, for which work they were awarded the Nobel Prize in Chemistry in 1950. The Diels–Alder reaction is particularly useful in synthetic organic chemistry as a reliable method for forming 6-membered systems with good control over regio- and stereochemical properties. The underlying concept has also been applied to other π-systems, such as carbonyls and imines, to furnish the corresponding heterocycles, known as the hetero-Diels–Alder reaction. Diels–Alder reactions can be reversible under certain conditions; the reverse reaction is known as the retro-Diels–Alder reaction.
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