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- W2144677205 abstract "In search of more active catalysts for the transfer hydrogenation of alkynes, a series of [Pd(NHC)(MA)1,2] (8–14) and [Pd(NHC)(dvtms)] complexes (1–7), in which the NHC ancillary ligands are expanded-ring N-heterocyclic carbenes (erNHC’s), have been prepared. These very bulky, strong σ-donor ligands impart a highly constrained geometry on the complexes and in some cases enable the isolation of coordinatively and electronically unsaturated complexes (10 and 14). Their strong σ-donor character is reflected in a decrease in IR stretching frequency for the C═O bond of the maleic anhydride ligands (8–14) in comparison to their five-membered counterparts. Significantly enhanced catalytic activity in the transfer hydrogenation of 1-phenyl-1-propyne is observed using [Pd(erNHC)(dvtms)] complexes (1–7) as precatalysts. The catalysts show high initial selectivity toward (Z)-alkene. However, double-bond isomerization and over-reduction to the corresponding alkane occur when all the alkyne substrate is consumed; this feature reflects the very high efficiency of these catalysts in the transfer hydrogenation of alkynes as well as alkenes." @default.
- W2144677205 created "2016-06-24" @default.
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- W2144677205 date "2012-12-19" @default.
- W2144677205 modified "2023-10-16" @default.
- W2144677205 title "Zerovalent [Pd(NHC)(Alkene)<sub>1,2</sub>] Complexes Bearing Expanded-Ring N-Heterocyclic Carbene Ligands in Transfer Hydrogenation of Alkynes" @default.
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- W2144677205 doi "https://doi.org/10.1021/om300930w" @default.
- W2144677205 hasPublicationYear "2012" @default.
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