том 27 издание 3 страницы 609-614

Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid

Тип публикацииJournal Article
Дата публикации2003-01-15
scimago Q2
wos Q3
БС1
SJR0.493
CiteScore5
Impact factor2.5
ISSN11440546, 13699261
Materials Chemistry
General Chemistry
Catalysis
Краткое описание
Structure and reactivity of vanadium(V) complexes formed in situ in the catalytic system VO(Oalkyl)3/hydroxamic acid/tert-butylhydroperoxide (TBHP) have been examined by means of 51V, 13C and 17O NMR spectroscopy. For the first time, reactive vanadium(V) alkylperoxo intermediates in vanadium/hydroxamic acid epoxidations were observed and spectroscopically characterized. With a planar-chiral [2.2]paracyclophane-derived hydroxamate as ligand two diastereomeric alkylperoxo vanadium(V) complexes were formed in a 3∶1 ratio. They differ in the relative positioning of the VO group and the planar-chiral aromatic part. Upon addition of geraniol as substrate, these complexes disappear in a parallel manner, and geraniol epoxide is formed. Probably, the existence of these two diastereomeric complexes and their comparable reactivity account for the observed enantioselectivity level (≤71% ee) and hence sets a fundamental limitation for the use of such ligands in this asymmetric catalysis.
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Bryliakov K. P. et al. Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid // New Journal of Chemistry. 2003. Vol. 27. No. 3. pp. 609-614.
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Bryliakov K. P., Talsi E. P., Kühn T., Bolm C. Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid // New Journal of Chemistry. 2003. Vol. 27. No. 3. pp. 609-614.
RIS |
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TY - JOUR
DO - 10.1039/b208748k
UR - https://doi.org/10.1039/b208748k
TI - Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid
T2 - New Journal of Chemistry
AU - Bryliakov, Konstantin P.
AU - Talsi, Evgenii P.
AU - Kühn, Toralf
AU - Bolm, Carsten
PY - 2003
DA - 2003/01/15
PB - Royal Society of Chemistry (RSC)
SP - 609-614
IS - 3
VL - 27
SN - 1144-0546
SN - 1369-9261
ER -
BibTex |
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@article{2003_Bryliakov,
author = {Konstantin P. Bryliakov and Evgenii P. Talsi and Toralf Kühn and Carsten Bolm},
title = {Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid},
journal = {New Journal of Chemistry},
year = {2003},
volume = {27},
publisher = {Royal Society of Chemistry (RSC)},
month = {jan},
url = {https://doi.org/10.1039/b208748k},
number = {3},
pages = {609--614},
doi = {10.1039/b208748k}
}
MLA
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Bryliakov, Konstantin P., et al. “Multinuclear NMR study of the reactive intermediates in enantioselective epoxidations of allylic alcohols catalyzed by a vanadium complex derived from a planar-chiral hydroxamic acid.” New Journal of Chemistry, vol. 27, no. 3, Jan. 2003, pp. 609-614. https://doi.org/10.1039/b208748k.