Carbene complexes

Coleman, Anthony W.; Hitchcock, Peter B.; Läppert, Michael F.; Maskell, Robin K.; Müller, J.

doi:10.1016/0022-328x(85)80348-x

Cited by 78 publications

(18 citation statements)

References 19 publications

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“…Examples of skeletal arrangements of such EROs, other than those shown in 1 or 8, are illustrated in 11-17. Optically active EROs 13-16 were obtained by syntheses based on the appropriate S-amino-acid (13)(14)(15) or R-(À)-trans-1,2-diaminocyclohexane (16) [16].…”

Section: Synthesis Of Ero-derived Transition Metal Carbene Complexesmentioning

confidence: 99%

Contributions to the chemistry of carbenemetal chemistry

Läppert

2005

Journal of Organometallic Chemistry

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122

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Section: Synthesis Of Ero-derived Transition Metal Carbene Complexesmentioning

confidence: 99%

Contributions to the chemistry of carbenemetal chemistry

Läppert

2005

Journal of Organometallic Chemistry

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122

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“…A much shorter rhodium-carbene bond length of 1.919 was published by Lappert in 1985 using the stronger s-donor imidazolidin-2-ylidene ligand of chloro-trans-(4-isobutyl-1,3-dimethylimidazolidin-2-ylidene)bis(triphenylphosphine)rhodium(I). [41] The difference between both enantiomers of complex 5, which presumably only exist in the solid state, is the rotation direction of the bonded phenoxy groups. In the direction of the acute angle at the phosphorus all oxygen atoms are pointing in the same direction with the phenyl groups.…”

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confidence: 99%

Synthesis and Characterization of N‐Heterocyclic Carbene Substituted Phosphine and Phosphite Rhodium Complexes and their Catalytic Properties in Hydrogenation Reactions

et al. 2007

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Mixed N-heterocyclic carbene-substituted phosphine and phosphite complexes of rhodium were prepared, starting from [RhA C H T U N G T R E N N U N G (COE) 2 Cl] 2 (COE = cyclooctene) by addition of free N-heterocyclic carbenes (NHC) and PR 3 . All new complexes were characterized by spectroscopy. In addition, the structures of trans-chloro(1,3-dicyclohexylimidazol-2-ylidene)-bis(triphenylphosphite)rhodium(I) (5), chloro-trans-bis(1,3-dicyclohexylimidazol-2-ylidene) (triphenylphosphine)rhodium(I) (6), and chloro(h8) were determined by single crystal X-ray analyses. The hydrogenation of cyclohexene using molecular hydrogen has been optimized for some N-heterocyclic carbene-substituted phosphine and phosphite rhodium complexes by variation of the reaction conditions.

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“…Complex rac ‐ 9 a behaves analogously ( δ (C2)=212.3 ppm, 1 J (C,Rh)=45 Hz). Lappert and co‐workers reported a similar behavior for rhodium–carbene complexes obtained by cleavage of asymmetrically substituted enetetramines 8b. Compared to rhodium complexes with benzannulated ( δ =195.9 ppm)17 and unsaturated (imidazolin‐2‐ylidene) ( δ =180.1 ppm)18 carbene ligands, the C2 resonance in the 13 C NMR spectra of rac ‐ 9 a and rac ‐ 9 b is shifted downfield, whereas in comparison with acyclic carbene ligands ( δ= 233.6 ppm),19 a small upfield shift is observed for this resonance.…”

Section: Methodsmentioning

confidence: 66%