Abstract
(Salen)Mn(III) catalysts show increased turnover numbers in the catalytic asymmetric epoxidation of conjugated olefins upon addition of bulky Lewis acids (LA) such as zinc tetraphenylporphyrin (ZnTPP). Up to 3-fold increase in total catalytic activity and at least a 20-fold increase in catalyst stability was observed with a (salen)Mn catalyst bearing pendant 5,5′-bis-pyridyl groups. This latter enhancement is primarily attributed to formation of a coordination triad, which provides steric protection for the catalyst from bimolecular decomposition. Supramolecular complex formation enhanced the catalyst's stability without compromising its enantioselectivity.
| Original language | English |
|---|---|
| Pages (from-to) | 15-20 |
| Number of pages | 6 |
| Journal | Journal of Molecular Catalysis A: Chemical |
| Volume | 174 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Oct 1 2001 |
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Keywords
- Asymmetric epoxidation
- Catalytic epoxidation
- Manganese
- Salen
- Supramolecular chemistry
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
Cite this
Enhanced activity of enantioselective (salen)Mn(III) epoxidation catalysts through supramolecular complexation. / Morris, Gregory A.; Nguyen, SonBinh T.; Hupp, Joseph T.
In: Journal of Molecular Catalysis A: Chemical, Vol. 174, No. 1-2, 01.10.2001, p. 15-20.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Enhanced activity of enantioselective (salen)Mn(III) epoxidation catalysts through supramolecular complexation
AU - Morris, Gregory A.
AU - Nguyen, SonBinh T.
AU - Hupp, Joseph T
PY - 2001/10/1
Y1 - 2001/10/1
N2 - (Salen)Mn(III) catalysts show increased turnover numbers in the catalytic asymmetric epoxidation of conjugated olefins upon addition of bulky Lewis acids (LA) such as zinc tetraphenylporphyrin (ZnTPP). Up to 3-fold increase in total catalytic activity and at least a 20-fold increase in catalyst stability was observed with a (salen)Mn catalyst bearing pendant 5,5′-bis-pyridyl groups. This latter enhancement is primarily attributed to formation of a coordination triad, which provides steric protection for the catalyst from bimolecular decomposition. Supramolecular complex formation enhanced the catalyst's stability without compromising its enantioselectivity.
AB - (Salen)Mn(III) catalysts show increased turnover numbers in the catalytic asymmetric epoxidation of conjugated olefins upon addition of bulky Lewis acids (LA) such as zinc tetraphenylporphyrin (ZnTPP). Up to 3-fold increase in total catalytic activity and at least a 20-fold increase in catalyst stability was observed with a (salen)Mn catalyst bearing pendant 5,5′-bis-pyridyl groups. This latter enhancement is primarily attributed to formation of a coordination triad, which provides steric protection for the catalyst from bimolecular decomposition. Supramolecular complex formation enhanced the catalyst's stability without compromising its enantioselectivity.
KW - Asymmetric epoxidation
KW - Catalytic epoxidation
KW - Manganese
KW - Salen
KW - Supramolecular chemistry
UR - http://www.scopus.com/inward/record.url?scp=0035478897&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035478897&partnerID=8YFLogxK
U2 - 10.1016/S1381-1169(01)00165-0
DO - 10.1016/S1381-1169(01)00165-0
M3 - Article
VL - 174
SP - 15
EP - 20
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
SN - 1381-1169
IS - 1-2
ER -