Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2)
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2007
Authors
Scheeren, CarlaMaasarani, Fida
Hijazi, Akram
Đukić, Jean-Pierre
Pfeffer, Michel
Zarić, Snežana D.
Le Goff, Xavier-Frederic
Ricard, Louis
Article (Published version)
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The reactivity of a set of prototypical (eta(6)-arene)tricarbonylchromium complexes bearing amino, oxazolyl, and pyridyl ancillary ligands versus [Cp*RhCl2](2) and [Cp*IrCl2](2) has been investigated. Successful cyclometalation reactions were achieved essentially in the presence of hydrated sodium acetate with planar-prochiral 2-phenylpyridine and 3-methyl-2-phenylpyridine complexes with yields ranging from 60% to 92%. The most salient feature of the reported reactions is their stereoselectivity, as the only diastereomers to be produced are those with the Rh- and Ir-bound chloro ligand located trans with respect to the Cr(CO)(3). According to X-ray diffraction analyses, a relative rac-(pR,T-4-S) configuration may be assigned to the complexes: the Cp* ligand sits unexpectedly syn with respect to the tricarbonylmetal moiety. Introduction of the Cr(CO)(3) moiety by treatment of cycloiridated 2-phenylpyridine with tricarbonyl(eta(6)-naphthalene)chromium resulted in a unique diastereomer of... the same relative configuration. Quantum calculations using the density functional theory were carried out on models of syn and trans-chloro isomers. Owing to strong electrostatic repulsion between the chloro ligand and the Cr(CO)(3) moiety, the syn-chloro isomers were found less stable by 7-8 kcal/mol than the trans counterparts, suggesting that cyclorhodation and cycloiridation reactions are thermodynamically controlled.
Source:
Organometallics, 2007, 26, 14, 3336-3345Publisher:
- Amer Chemical Soc, Washington
Funding / projects:
- Proučavanje odnosa reaktivnosti, nekovalentnih interakcija i strukture molekula i modelovanje hemijskih sistema (RS-MESTD-MPN2006-2010-142037)
DOI: 10.1021/om070170l
ISSN: 0276-7333
WoS: 000247436400014
Scopus: 2-s2.0-34547380846
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Hemijski fakultet / Faculty of ChemistryTY - JOUR AU - Scheeren, Carla AU - Maasarani, Fida AU - Hijazi, Akram AU - Đukić, Jean-Pierre AU - Pfeffer, Michel AU - Zarić, Snežana D. AU - Le Goff, Xavier-Frederic AU - Ricard, Louis PY - 2007 UR - https://cherry.chem.bg.ac.rs/handle/123456789/843 AB - The reactivity of a set of prototypical (eta(6)-arene)tricarbonylchromium complexes bearing amino, oxazolyl, and pyridyl ancillary ligands versus [Cp*RhCl2](2) and [Cp*IrCl2](2) has been investigated. Successful cyclometalation reactions were achieved essentially in the presence of hydrated sodium acetate with planar-prochiral 2-phenylpyridine and 3-methyl-2-phenylpyridine complexes with yields ranging from 60% to 92%. The most salient feature of the reported reactions is their stereoselectivity, as the only diastereomers to be produced are those with the Rh- and Ir-bound chloro ligand located trans with respect to the Cr(CO)(3). According to X-ray diffraction analyses, a relative rac-(pR,T-4-S) configuration may be assigned to the complexes: the Cp* ligand sits unexpectedly syn with respect to the tricarbonylmetal moiety. Introduction of the Cr(CO)(3) moiety by treatment of cycloiridated 2-phenylpyridine with tricarbonyl(eta(6)-naphthalene)chromium resulted in a unique diastereomer of the same relative configuration. Quantum calculations using the density functional theory were carried out on models of syn and trans-chloro isomers. Owing to strong electrostatic repulsion between the chloro ligand and the Cr(CO)(3) moiety, the syn-chloro isomers were found less stable by 7-8 kcal/mol than the trans counterparts, suggesting that cyclorhodation and cycloiridation reactions are thermodynamically controlled. PB - Amer Chemical Soc, Washington T2 - Organometallics T1 - Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2) VL - 26 IS - 14 SP - 3336 EP - 3345 DO - 10.1021/om070170l ER -
@article{ author = "Scheeren, Carla and Maasarani, Fida and Hijazi, Akram and Đukić, Jean-Pierre and Pfeffer, Michel and Zarić, Snežana D. and Le Goff, Xavier-Frederic and Ricard, Louis", year = "2007", abstract = "The reactivity of a set of prototypical (eta(6)-arene)tricarbonylchromium complexes bearing amino, oxazolyl, and pyridyl ancillary ligands versus [Cp*RhCl2](2) and [Cp*IrCl2](2) has been investigated. Successful cyclometalation reactions were achieved essentially in the presence of hydrated sodium acetate with planar-prochiral 2-phenylpyridine and 3-methyl-2-phenylpyridine complexes with yields ranging from 60% to 92%. The most salient feature of the reported reactions is their stereoselectivity, as the only diastereomers to be produced are those with the Rh- and Ir-bound chloro ligand located trans with respect to the Cr(CO)(3). According to X-ray diffraction analyses, a relative rac-(pR,T-4-S) configuration may be assigned to the complexes: the Cp* ligand sits unexpectedly syn with respect to the tricarbonylmetal moiety. Introduction of the Cr(CO)(3) moiety by treatment of cycloiridated 2-phenylpyridine with tricarbonyl(eta(6)-naphthalene)chromium resulted in a unique diastereomer of the same relative configuration. Quantum calculations using the density functional theory were carried out on models of syn and trans-chloro isomers. Owing to strong electrostatic repulsion between the chloro ligand and the Cr(CO)(3) moiety, the syn-chloro isomers were found less stable by 7-8 kcal/mol than the trans counterparts, suggesting that cyclorhodation and cycloiridation reactions are thermodynamically controlled.", publisher = "Amer Chemical Soc, Washington", journal = "Organometallics", title = "Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2)", volume = "26", number = "14", pages = "3336-3345", doi = "10.1021/om070170l" }
Scheeren, C., Maasarani, F., Hijazi, A., Đukić, J., Pfeffer, M., Zarić, S. D., Le Goff, X.,& Ricard, L.. (2007). Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2). in Organometallics Amer Chemical Soc, Washington., 26(14), 3336-3345. https://doi.org/10.1021/om070170l
Scheeren C, Maasarani F, Hijazi A, Đukić J, Pfeffer M, Zarić SD, Le Goff X, Ricard L. Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2). in Organometallics. 2007;26(14):3336-3345. doi:10.1021/om070170l .
Scheeren, Carla, Maasarani, Fida, Hijazi, Akram, Đukić, Jean-Pierre, Pfeffer, Michel, Zarić, Snežana D., Le Goff, Xavier-Frederic, Ricard, Louis, "Stereoselective "electrophilic" cyclometalation of planar-prochiral (eta(6)-arene)tricarbonylchromium complexes with asymmetric metal centers: pseudo-T-4 [Cp*RhCl2](2) and [Cp*IrCl2](2)" in Organometallics, 26, no. 14 (2007):3336-3345, https://doi.org/10.1021/om070170l . .