A Giant Vesicle Forming Single Tailed Chiral Surfactant for Enantioseparation by Micellar Electrokinetic Chromatography
Authors: A. Mohanty and J. DeyVol: Pages: 1384-1385Journal: Chem. Commun. Year: 2003 Posted: 25 Feb 2020
Self-organization and Microstructures of Sodium 11-acrylamidoundecanoate in water
Authors: S. Roy and J. DeyVol: 19 Pages: 9625-9629Journal: Langmuir Year: 2003 Posted: 25 Feb 2020
Molecular Modeling of RecX Reveals its Mode of Interaction with RecA.
Authors: S. Mishra, P.A. Mazumdar, J. Dey and A. K. DasVol: 312 Pages: 615-622Journal: Biochem. Biophys. Res. Commun. Year: 2003 Posted: 25 Feb 2020
Authors: Singh, Pradeep. N. D.; Mandel, S. M.; Zhu, Z.; Franz, R.; Ault, B. S.; Gudmundsdottir, A. D.Vol: 68 Pages: 7951-7960Journal: The Journal of Organic Chemistry Year: 2003 Posted: 27 Jun 2019
We report the first detection of triplet alkyl nitrenes in fluid solution by laser flash photolysis of α-azido acetophenone derivatives, 1<\/strong>. Αzides 1<\/strong>contain an intramolecular triplet sensitizer, which ensures formation of the triplet alkyl nitrene by bypassing the singlet nitrene intermediate. At room temperature, azides 1<\/strong> cleave to form benzoyl and methyl azide radicals in competition with triplet energy transfer to form triplet alkyl nitrene. The major photoproduct 3<\/strong> arises from interception of the triplet alkyl nitrene with benzoyl radicals. The triplet alkyl nitrene intermediates are also trapped with molecular oxygen to yield the corresponding 2-nitrophenylethanone. Laser flash photolysis of 1<\/strong> reveals that the triplet alkyl nitrenes have absorption around 300 nm. The triplet alkyl nitrenes were further characterized by obtaining their UV and IR spectra in argon matrices. 13C and 15N isotope labeling studies allowed us to characterize the C−N stretch of the nitrene intermediate at 1201 cm-1.<\/p>")">
Designing Esters Which Release Alcohols Upon Exposure To Light.
Authors: Pika, J.; Konosonoks, A.; Singh, Pradeep. N. D.; Gudmundsdottir, A. D.Vol: 16 Pages: 12-17Journal: The Spectrum Year: 2003 Posted: 27 Jun 2019
Authors: Singh, Pradeep. N. D.; Muthukrishnan, S.; Murthy, R. S.; Klima, R. F.; Mandel, S. M.; Hawk, M.; Yarbrough, N.; Gudmundsdóttir. A. D.Vol: 44 Pages: 9169-9171Journal: Tetrahedron Letter Year: 2003 Posted: 27 Jun 2019
A simple and efficient method for preparing β- and γ-azido substituted arylketones has been achieved by short microwave irradiation of the corresponding halo arylketones and sodium azide in DMSO.<\/p>\r\n\r\nA simple and efficient method for preparing β- and γ-azido substituted arylketones has been achieved by short microwave irradiation of the corresponding halo arylketones and sodium azide in DMSO<\/p>")">
Authors: Singh, Pradeep. N. D.; Carter, C. L.; Gudmundsdóttir, A. D.Vol: 44 Pages: 6763-6765Journal: Tetrahedron Letter Year: 2003 Posted: 27 Jun 2019
An efficient and environmentally friendly method preparing 2H-azirines in good yield has been achieved by microwave irradiation of vinyl azides in solvent free conditions.<\/p>\r\n\r\nAn efficient and environmentally friendly method preparing 2H-azirines has been achieved by microwave irradiation of vinyl azides in solvent free conditions.<\/p>")">
Authors: Pika, J.; Konosonoks, A.; Robinson, R. M.; Singh, Pradeep. N. D.; Gudmundsdottir, A. DVol: 68 Pages: 1964-1972Journal: The Journal of Organic Chemistry Year: 2003 Posted: 27 Jun 2019
We have designed molecules which release alcohols upon exposure to UV light independent of the reaction media, making it possible to liberate alcohols in a controlled manner in applications. Photolysis of 2-(2-isopropylbenzoyl)benzoate ester derivatives 4<\/strong> in various solvents and in thin films results in the liberation of the alcohol moiety from the ester. The reaction mechanism for the release of the alcohol has been elucidated by time-resolved laser flash photolysis. Upon irradiation the triplet excited state of ketone, 4<\/strong> is formed, and its lifetime can be estimated to be between 0.08 and 0.8 ns. The triplet excited state decays by efficient intramolecular H-atom abstraction to form a 1,4-biradical, 8<\/strong>, that has a lifetime of less than 17 ns and is trapped by molecular oxygen. In the absence of oxygen, biradical 8<\/strong> intersystem crosses to form photoenols (Z<\/em>)-9<\/strong> and (E<\/em>)-10<\/strong> in a ratio of 5:2, respectively. Photoenol (Z<\/em>)-9<\/strong> has a lifetime of ∼3000 ns in protic solvents and returns to the starting material through 1,5 intramolecular hydrogen transfer. The other isomer, (E<\/em>)-10<\/strong>, is much longer lived (>1 ms) and releases the alcohol moiety through an intramolecular lactonization.<\/p>")">
A giant vesicle forming single tailed chiral surfactant for enantioseparation by micellar electrokinetic chromatography
Authors: A. Mohanty and J. Dey Journal: J. Chem. Soc. Chem. Comm., 1384-1385 PP (2003) Year: 2003 Posted: 22 Dec 2018
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