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Rhodium(I) N-heterocyclic carbene complexes as highly selective catalysts for 1-hexene hydroformylation.
Autorzy
Rok wydania
2008
Czasopismo
Numer woluminu
27
Strony
4131-4138
DOI
10.1021/om800143m
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Rhodium(I) carbene complexes of the type [Rh(NHC)(cod)X] (where NHC = N-heterocyclic carbene obtained from dialkylimidazolium cation; cod = 1,5-cyclooctadiene; X = Cl, Br, I, SCN) with P(OPh)3 as a modifying ligand have been found to be very active catalysts for 1-hexene hydroformylation under mild conditions (80 °C, 10 atm of H2/CO, 4 h). Even at a low rhodium concentration ([1-hexene]/[Rh] = 2000), aldehydes have been obtained in yields of up to 90% with a high n/iso ratio of ca. 7. During the catalytic process, rhodium(I) carbene complexes, [Rh(NHC)(P(OPh)3)2X], reacted with H2/CO, giving a catalytically active rhodium(I) hydrido complex containing an N-heterocyclic carbene ligand. The presence of [HRh(CO)(P(OPh)3)3] and [Rh(NHC)(P(OPh)3)(CO)X] complexes in the catalytic system has been confirmed. When P(OCH2CF3)3 was used as modifying ligand with [Rh(NHC)(cod)Br] as catalyst precursor, formation of [HRh(CO)(NHC)(P(OCH2CF3)3)2] with a square-pyramidal structure was evidenced by 1H and 31P NMR.
Adres publiczny
https://doi.org/10.1021/om800143m
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