Synthesis and Coordination of the New Chiral Tridentate O,N,O Ligand 2,6-Bis[(1S,2S,5R)-(−)-menthyl]pyridine to Molybdenum(VI) and Vanadium(V) Oxo Complexes: Crystal Structures of [(2,6-Bis{(−)-menthyl}pyridine)MoO2] and [(2,6-Bis{(−)-menthyl}pyridine)VO]2(μ-O)

• Published in: European journal of inorganic chemistry Vol. 2000; no. 7; pp. 1645 - 1649
• Main Authors: Bellemin-Laponnaz, Stéphane, Coleman, Karl S., Dierkes, Peter, Masson, Jean-Pierre, Osborn, John A.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag GmbH 01.07.2000; WILEY‐VCH Verlag GmbH
• Subjects: Chiral ligands; Homogeneous catalysis; Molybdenum; Oxo complexes; Vanadium
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/1099-0682(200007)2000:7<1645::AID-EJIC1645>3.0.CO;2-H

The novel tridentate chiral ligand 2,6‐bis{(−)‐menthyl}pyridine (1), was readily prepared from the reaction of 2,6‐dilithiopyridine with (−)‐menthone. Reaction of 1 with VO(OiPr)3 and [MoO2(acac)2] resulted in the formation of the new metal‐oxo complexes [VO(ONO)]2(μ‐O) (2) and [MoO2(ONO)] (3) [ONO = (1 − 2 H)]. Both metal‐oxo compounds 2 and 3 have demonstrated the ability to catalyze the asymmetric oxidation of prochiral olefins with tBuOOH as the oxidant. The compounds 1−3 have been fully characterized by 1H, 13C and 51V (where appropriate) NMR spectroscopy, mass spectrometry, microanalysis and IR spectroscopy. Furthermore, the molecular structures of 2 and 3 have been determined by single‐crystal X‐ray diffraction.