Molybdenum(VI) cis-dioxo complexes with chiral schiff base ligands: Synthesis, characterization, and catalytic applications

Xiangge Zhou; Jin Zhao; Ana M. Santos; Fritz E. Kühn

Molybdenum(VI) cis-dioxo complexes with chiral schiff base ligands: Synthesis, characterization, and catalytic applications

Xiangge Zhou
, Jin Zhao
, Ana M. Santos
, Fritz E. Kühn

Associate Professorship of Molecular Catalysis

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO₂(L)(Solv) and WO₂(L) (L = tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv = alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-β-methylstyrene moderate enantiomeric excesses of up to 26% can be reached when the reaction is carried out at 0°C.

Original language	English
Pages (from-to)	1223-1228
Number of pages	6
Journal	Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume	59
Issue number	11-12
State	Published - 2004

Keywords

Catalysis
Chirality
Epoxidation
Molybdenum
Salen

Cite this

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title = "Molybdenum(VI) cis-dioxo complexes with chiral schiff base ligands: Synthesis, characterization, and catalytic applications",

abstract = "Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO2(L)(Solv) and WO2(L) (L = tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv = alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-β-methylstyrene moderate enantiomeric excesses of up to 26\% can be reached when the reaction is carried out at 0°C.",

keywords = "Catalysis, Chirality, Epoxidation, Molybdenum, Salen",

author = "Xiangge Zhou and Jin Zhao and Santos, \{Ana M.\} and K{\"u}hn, \{Fritz E.\}",

year = "2004",

language = "English",

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journal = "Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences",

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TY - JOUR

T1 - Molybdenum(VI) cis-dioxo complexes with chiral schiff base ligands

T2 - Synthesis, characterization, and catalytic applications

AU - Zhou, Xiangge

AU - Zhao, Jin

AU - Santos, Ana M.

AU - Kühn, Fritz E.

PY - 2004

Y1 - 2004

N2 - Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO2(L)(Solv) and WO2(L) (L = tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv = alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-β-methylstyrene moderate enantiomeric excesses of up to 26% can be reached when the reaction is carried out at 0°C.

AB - Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO2(L)(Solv) and WO2(L) (L = tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv = alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-β-methylstyrene moderate enantiomeric excesses of up to 26% can be reached when the reaction is carried out at 0°C.

KW - Catalysis

KW - Chirality

KW - Epoxidation

KW - Molybdenum

KW - Salen

UR - https://www.scopus.com/pages/publications/12444320299

M3 - Article

AN - SCOPUS:12444320299

SN - 0932-0776

VL - 59

SP - 1223

EP - 1228

JO - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

JF - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

IS - 11-12

ER -

Molybdenum(VI) cis-dioxo complexes with chiral schiff base ligands: Synthesis, characterization, and catalytic applications

Abstract

Keywords

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