Hydrogen‐transfer reduction of α,β‐unsaturated carbonyl compounds catalyzed by naphthyridine‐functionalized N‐heterocyclic carbene complexes

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<jats:p>Substitution of silver complex of 2‐chloro‐7‐(mesitylimidazolylidenylmethyl)naphthyridine (NpNHC) with palladium(II), rhodium(I) and iridium(I) metal precursors provided [Pd(<jats:italic>C</jats:italic>,<jats:italic>N</jats:italic>‐NpNHC)(η<jats:sup>3</jats:sup>‐allyl)](BF<jats:sub>4</jats:sub>) (<jats:bold>5</jats:bold>), RhCl(COD)(<jats:italic>C</jats:italic>‐NpNHC) (<jats:bold>6a</jats:bold>) and IrCl(COD)(<jats:italic>C</jats:italic>‐NpNHC) (<jats:bold>6b</jats:bold>), respectively. Abstraction of chloride from <jats:bold>6a</jats:bold> and <jats:bold>6b</jats:bold> with AgBF<jats:sub>4</jats:sub> provided the chelation complexes [Rh(COD)(<jats:italic>C</jats:italic>,<jats:italic>N</jats:italic>‐NpNHC)](BF<jats:sub>4</jats:sub>) (<jats:bold>7a</jats:bold>) and Ir(COD)(<jats:italic>C</jats:italic>,<jats:italic>N</jats:italic>‐NpNHC)(BF<jats:sub>4</jats:sub>) (<jats:bold>7b</jats:bold>), respectively. All complexes were characterized using NMR and elemental analyses and the structural details of <jats:bold>5</jats:bold> and <jats:bold>6a</jats:bold> were further confirmed using X‐ray crystallography. In catalytic activity studies, complex <jats:bold>5</jats:bold> was found to be an effective catalyst in the hydrogen‐transfer reduction of α,β‐unsaturated carbonyl compounds into the corresponding saturated carbonyl compounds.</jats:p>

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