C2 and C1-Symmetric Camphopyrazole Dioxomolybdenum(VI) Complexes catalyze the Epoxidation of Cyclic Olefins

Aguilera T, Pastrán J, Llovera L, Linden A, Herrera AC, Venuti D, Agrifoglio G, Dorta R (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Zeitschrift für Anorganische und Allgemeine Chemie Wiley

DOI: 10.1002/zaac.202300104

Abstract

Dioxomolybdenum(VI) complexes (1-6) were prepared in good yields (≥79 %) using enantiopure C2 and C1-symmetric bidentate N,N-ligands (L1-L6) derived from (+)-camphor. The ligands and complexes were characterized by NMR spectroscopy, IR, and elemental analysis. Single crystal X-ray diffraction analyses of complexes 3, 4 and 6 confirmed the bidentate coordination modes of ligands L3, L4, and L6 and revealed distorted octahedral coordination geometries around the metal center. Complexes 3 and 6 form conformational isomers depending on the orientation of the substituents of the ligand aryl groups. Preliminary evaluation of the complexes as catalysts for the epoxidation of cyclohexene (81–93 % conversion) and cis-cyclooctene (66–94 % conversion) with cumyl hydroperoxide and 35 % w/w aqueous hydrogen peroxide (39–73 %) demonstrated their activity for oxygen atom transfer reactions, opening the way for asymmetric epoxidations.

Authors with CRIS profile

Alberto Cesar Herrera Lehrstuhl für Anorganische und Allgemeine Chemie Romano Dorta Professur für Anorganische Chemie

Involved external institutions

Universidad Simón Bolívar VE Venezuela, Bolivarian Republic of (VE) Venezuelan Institute for Scientific Research / Instituto Venezolano de Investigaciones Científicas (IVIC) VE Venezuela, Bolivarian Republic of (VE) University of Zurich / Universität Zürich (UZH) CH Switzerland (CH) Central University of Venezuela (UCV) / Universidad Central de Venezuela VE Venezuela, Bolivarian Republic of (VE)

How to cite

APA:

Aguilera, T., Pastrán, J., Llovera, L., Linden, A., Herrera, A.C., Venuti, D.,... Dorta, R. (2023). C2 and C1-Symmetric Camphopyrazole Dioxomolybdenum(VI) Complexes catalyze the Epoxidation of Cyclic Olefins. Zeitschrift für Anorganische und Allgemeine Chemie. https://doi.org/10.1002/zaac.202300104

MLA:

Aguilera, Tania, et al. "C2 and C1-Symmetric Camphopyrazole Dioxomolybdenum(VI) Complexes catalyze the Epoxidation of Cyclic Olefins." Zeitschrift für Anorganische und Allgemeine Chemie (2023).

BibTeX: Download