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Dolores Herman
UNC at Chapel Hill
Department of Chemistry
CB #3290 Venable Hall
Chapel Hill, NC 27599-3920
phone: (919) 962 3790
fax: (919) 962 5467
email:dherman@email.unc.edu
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Projects Publications
& Presentations Directory
of all NSF students
Projects:
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Past:
Graduate research at UC Davis in the lab of Dr. Phillip Jessop.
Performed catalytic synthesis at high pressures (60-200 bar). The
enantioselectivity of the cyclopropanation of styrene and methyl
phenyldiazoacetate in the presence of a dirhodium carboxylate catalyst was
found to be pressure dependent in supercritical CHF3. A combined
SCF/liquid solvent study was performed to gain insight into the solvent
dependent enantioselectivity of this system. Assisted in developing
new solventless synthesis method involving gas-induced melting of
solids. Rate increases for hydrogenation and hydroformylation were
found with the addition of sub-critical pressures of carbon dioxide.
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Present:
The synthesis of low surface energy membrane materials for the use in
reverse osmosis and nano-filtration. Block copolymers of various
compositions will be synthesized which have both a hydrophilic segment and a
low surface energy flouropolymer segment. I will also continue the
work of Clay Bunyard on perfluoropolyethers. |
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Publications & Presentations:
Publications:
| Wynne, D.C. and Jessop, P.G., Supercritical and Liquid Solvent Effects
on the Enantioselectivity of Asymmetric Cycloprpanation with Tetrakis
[1-[(4-tert-butylphenyl)- sulfonyl]-(2S)-pyrrolidinecarboxylate]dirhodium(II),
JACS; 2000; 122(32); 7638-7647
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Phillip Jessop, Dolores C. Wynne, Scott DeHaai, Denise Nakawatase, Carbon
dioxide gas accelerates solventless synthesis, Chem. Commun., 2000,
693-694
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Wynne, D.C., Jessop, P.G., Cyclopropanation Enantioselectivity is
Pressure Dependent in Supercritical Fluoroform. Angew. Chem. Intl. Ed.,
1999, 38, 8, 1143-1144.
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Presentations:
| Wynne, D.C. and Jessop, P.G. The Use of Supercritical Fluids in
Asymmetric Catalysis to Tune Product Enantioselectivity and Isolation.
Presented to the 41st Rocky Mountain Conference on Analytical
Chemistry (August 1999). |
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