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Ananda Amarasekara
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Professor, Interim Head Department of Chemistry and Physics
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Recent Works
Recent Works
(104)
Article
Cycloaddition reactions of 5-hydroxymethyl-furan-2-nitrileoxide
Chemistry & Physics Faculty Publications (2007)
Ananda S. Amarasekara, Osayamen Edigin and Wendy Hernandez
5-Hydroxymethyl-furan-2-nitrileoxide undergoes [3+2] cycloadditions with alkenes to give 3-(2-furanyl)-4,5-dihydo-isoxazole ring system in 71-84% yield. Cycloaddition with one equivalent of dimethylacetylene ...
Article
One-pot synthesis of cobalt-salen catalyst immobilized in silica by sol-gel ...
Chemistry & Physics Faculty Publications (2007)
Ananda S. Amarasekara, Aderemi R. Oki, Ivana McNeal and Uchenna Uzoezie
Salen ligand prepared from 1,2-phenylenediamine and 2-hydroxy-3(3-triethoxysilyl-propyl)-benzaldehyde has been used as cobalt-chelate for the immobilization of the catalytic site by ...
Article
Effect of oversulfation on the chemical and biological properties of ...
Chemistry & Physics Faculty Publications (2007)
Ananda S. Amarasekara, Gloria Opoku, Xiangdong Qiu and Vasant Doctor
Chondroitin-6-sulfate was oversulfated using chlorosulfonic acid-pyridine complex and isolated as the sodium salt. Infrared analysis of the native and oversulfated ...
Article
Obtaining Prediction Bounds for a Weibull Life Distribution Using Multi-level ...
Journal of Statistical Computation and Simulation (2007)
Ananda Amarasekara Jayawardhana and V. A. Samaranayake
Link
Article
Baker's yeast (Saccharomyces cerevisiae) mediated transformations of C-aryl-N-phenylnitrones
Chemistry & Physics Faculty Publications (2006)
Ananda S. Amarasekara, Wendy Hernandez and Paul Bonham
C-Aryl-N-phenylnitrones are transformed to a mixture of azoxybenzene and aryl aldehydes when treated with a mixture of Baker's yeast and ...
Article
Effect of oversulfation on the chemical and biological properties of ...
Chemistry & Physics Faculty Publications (2006)
Xiangdong Qiu, Ananda Amarasekara and Vasant Doctor
Fucoidan was sulfated using chlorosulfonic acid-pyridine complex and isolated as the sodium salt. Infrared analysis of the native and sulfated ...
Article
Nitrosation of β′-hydroxylamino-α,β-unsaturated oximes: Synthesis of 1,7-dioxa-2 ...
Chemistry & Physics Faculty Publications (2005)
Ananda S. Amarasekara
Nitrosation of bis arylidene acetone oximes with nitrous acid in glacial acetic acid gives 3-vinyl pyrazolone-N,N′-dioxides in 32-37% yield. Similar ...
Article
Prediction Bounds for the Weibull Distribution
InterStat (2004)
Ananda Amarasekara Jayawardhana and V. A. Samaranayake
An approximate method for constructing prediction limits for a future Weibull observation, based on the Maximum Likelihood Predictive Density approach ...
Link
Article
Studies of planar poly(3,4-disubstituted-thiophenes)
Chemistry & Physics Faculty Publications (2003)
Martin Pomerantz and Ananda S. Amarasekara
Ab initio calculations on bithiophenes, confirmed by X-ray analysis, show how to design polythiophenes with C=O groups in both the ...
Article
Prediction Bounds in Accelerated Life Testing: Weibull Models with Inverse ...
Journal of Quality Technology (2003)
Ananda Amarasekara Jayawardhana and V. A. Samaranayake
Article
Synthesis and Study of Head-to-Tail Regioregular Poly(alkyl thiophene-3-carboxylates)
Chemistry & Physics Faculty Publications (2003)
Ananda S. Amarasekara and Martin Pomerantz
Regioregular head-to-tail poly(alkyl thiophene-3-carboxylates) have been prepared by very careful formation of the mono-Grignard reagent from alkyl 2,5-dibromothiophene-3-carboxylates (-40°C, 1 ...
Article
Synthesis and solid-state structures of dimethyl 2,2′-bithiophenedicarboxylates
Chemistry & Physics Faculty Publications (2002)
Martin Pomerantz, Ananda S. Amarasekara and H. V. Rasika Dias
The syntheses of dimethyl 2,2′-bithiophene-4,4′-dicarboxylate (3), dimethyl 2,2′-bithiophene-3,4′-dicarboxylate (4), and dimethyl 2,2′-bithiophene-3,3′-dicarboxylate (5) are described. Single-crystal X-ray structural analysis of ...
Article
Reaction of 1,4-phthalazinedione with furfural: Formation of the [5 ...
Chemistry & Physics Faculty Publications (2002)
Ananda S. Amarasekara and Susantha Chandrasekara
(equation presented) Oxidation of phthalahydrazide (1) with lead tetraacetate in the presence of furfural (3a) in methylene chloride gives [5,6]benza-3a,7a-diaza-3-carboxylindane-4,7-dione-1-ene ...
Article
Obtaining Prediction Bounds for a Weibull Life Distribution Using Multi-level ...
Joint Statistical Meetings (2002)
Ananda Amarasekara Jayawardhana and V. A. Samaranayake
Article
Competitive [3+2] and [4+2] cycloaddition reactions of 2-furaldehyde ...
Chemistry & Physics Faculty Publications (2000)
Ananda S. Amarasekara and W. Wimal Pathmasiri
Maleimides react with 2-furaldehyde phenylhydrazone 1 at the furan ring to give 4-(phenylhydrazono)methyl-1H-isoindole-1,3(2H)-diones when equimolar mixtures are refluxed in benzene ...
Article
Building BLOCK strategies for the synthesis of molecular clefts with ...
Chemistry & Physics Faculty Publications (1999)
Ronald N. Warrener, Davor Margetic, Ananda S. Amarasekara, Douglas N. Butler, et al.
(equation presented) A new general route to U-type cavity structures (molecular clefts) with inside functionality has been developed using wall ...
Article
Synthesis of functionalized cavity structures via 1,3-dipolar cycloaddition of ...
Chemistry & Physics Faculty Publications (1999)
Ronald N. Warrener, Davor Margetic, Ananda S. Amarasekara and Richard A. Russell
(Equation Presented) A new approach to the synthesis of cavity molecules is described in which the 1,3-dipolar ACE coupling method ...
Article
Molecular topology: The synthesis of a new class of rigid ...
Chemistry & Physics Faculty Publications (1999)
Ronald N. Warrener, Davor Margetic, Guanxing Sun, Ananda S. Amarasekara, et al.
Norbornadienes and 7-heteronorbornadienes are reacted with 7-oxa (or carba or aza) norbornene-fused cyclobutene epoxides (or aziridines) to produce hetero-bridged polynorbornane ...
Article
A new synthesis of quinoline-5,8-quinone
Chemistry & Physics Faculty Publications (1999)
Ananda S. Amarasekara
Sensitised photo-oxidations of 8-hydroxy quinoline (1) or 5-hydroxy quinoline (2) gives quinoline-5,8-quinone (3) in 64-70% yield.
Article
Regiochemical control in the addition of aryl N-sulphinylamines to juglone ...
Chemistry & Physics Faculty Publications (1998)
Ananda S. Amarasekara and W. Wimal Pathmasiri
Regiochemistry of addition of N-aryl-sulphinylamines to juglone and juglone derivatives is controlled by the nature of the oxygen function at ...
Article
A Simple Entry to Fused N-Aryl 1,2-Thiazetidine-S-Oxides: Thermal Isomerisation ...
Chemistry & Physics Faculty Publications (1997)
Ronald N. Warrener and Ananda S. Amarasekara
We show that fused 1,2-thiazetidine-S-oxides can be produced in one step from readily available aryl sulfonylamines by cycloaddition with quadricyclane; ...
Article
The Impact of Alcohol and Drug Use on Employment: A ...
IDEAS (1996)
Ananda Amarasekara Jayawardhana, V. A. Samaranayake and Allen Wilhite
The purpose of this study was, first, to estimate of the impact of alcohol and drug use on the employment ...
Article
The synthesis of the N-ethoxycarbonyl derivative of 5-azabicyclo[2.1 ...
Chemistry & Physics Faculty Publications (1996)
Ronald N. Warrener, Ananda S. Amarasekara and Richard A. Russell
N-Ethoxycarbonyl Dewar pyrrole 9, the first member of the parent ring, is formed via photofragmentation of 6 at -60°C and ...
Article
A novel reaction of aryl N-sulphinylamines, addition to 1,4-naphthoquinone.
Chemistry & Physics Faculty Publications (1993)
Ananda S. Amarasekara and W. Wimal Pathmasiri
Aryl N-sulphinylamines react with 1,4-naphthoquinone to give 2-arylsulphimoyl-1,4-naphthoquinones. © 1993.
Article
A novel method of ring formation with functionalized angular methyl ...
Chemistry & Physics Faculty Publications (1988)
Alfred Hassner, Ananda S. Amarasekara, Albert Padwa and William H. Bullock
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