Brunner, Henri and Neuhierl, T. and Nuber, B. (1998) Optically active transition metal complexes, 118 - Unusual crystal structures of (RRuRC/SRuRC)-(n(6)-p-cymene)Ru complexes - Diastereomers with opposite configuration at the metal center in the unit cell. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (12). pp. 1877-1881. ISSN 1434-1948,
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Condensation of (R)-2-aminobutanol with salicylaldehyde and 2-pyrrolecarbaldehyde gave the chiral chelate Ligands HLL1* and HLL2*, respectively. The diastereomeric complexes (R-Ru,R-C)- and (S-Ru,R-C)-[(eta(6)-arene)Ru(LL1*)Cl], eta(6)-arene = p-cymene (1a/1b), eta(6)-arene = benzene (2a/2b), and (R-Ru,R-C)- and (S-Ru,R-C)-[(eta(6)-arene)Ru(LL2*)Cl], eta(6)-arene = p-cymene (3a/b), eta(6)-arene = benzene (4a/4b), which only differ in the ruthenium configuration, were prepared by the reaction of [(eta(6)-arene)RuCl2](2) with the anion of the corresponding Ligand HLL*. X-ray analyses of 1a/1b and 3a/\3b showed a structural peculiarity. The unit cell of these complexes contained diastereomers with the same configuration at the carbon atoms but opposite configuration at the metal centers in a 1:1 ratio. Weak intramolecular O-H ... Cl hydrogen bridges were formed in all the complexes. H-1-NMR studies demonstrated me configurational lability at the Ru center. The iodo complexes (R-Ru,R-C)- and (S-Ru,R-C)-[(eta(6)-p-cymene)Ru(LL*)I], LL* = LL1* (5a/5b) and LL* = LL2* (6a/6b), were synthesized by halogen exchange.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ASYMMETRIC TRANSFER HYDROGENATION; X-RAY STRUCTURE; RUTHENIUM ATOM; STEREOCHEMISTRY; LIGAND; KETONES; crystal structures; diastereomers; half-sandwich complexes; ruthenium |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Henri Brunner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Feb 2023 06:56 |
| Last Modified: | 21 Feb 2023 06:56 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49284 |
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