A5022560128- Synthesis of Organic Compounds
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Bioactive natural compounds
- Synthetic Organic Chemistry Methods
- Natural product bioactivities and synthesis
- Carbohydrate Chemistry and Synthesis
- Chemical Synthesis and Reactions
- Crystal structures of chemical compounds
- Asymmetric Synthesis and Catalysis
- Oxidative Organic Chemistry Reactions
- Chemical Synthesis and Analysis
- Molecular spectroscopy and chirality
- Metal complexes synthesis and properties
- Asymmetric Hydrogenation and Catalysis
- Synthesis and biological activity
- Biological Activity of Diterpenoids and Biflavonoids
- Synthesis of Indole Derivatives
- Organic Chemistry Cycloaddition Reactions
- Multicomponent Synthesis of Heterocycles
- Organometallic Complex Synthesis and Catalysis
- Microbial Natural Products and Biosynthesis
- Phytochemistry and Biological Activities
- Traditional and Medicinal Uses of Annonaceae
- Catalytic Cross-Coupling Reactions
University of the Free State
2013-2024
Clinvet
2015
University of Cape Town
2012
Sasol (Germany)
2006
University of Mississippi
2000
University of Cambridge
1994-1995
Northwestern University
1989-1992
Colorado State University
1991
Northwest University
1989-1990
Out with convention! The use of borosalicylic acid, derived from boric and salicylic acids, as the acid promoter in methoxycarbonylation ethylene to give methyl propionate has been investigated (see scheme). Not only was moderate catalyst activity observed, but much lower formation phosphonium salts occurred than conventional acids. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z603751_s.pdf or author. Please note: publisher...
Tin oxide (SnO2) nanocrystals (NCs) based phosphor was synthesized by a green chemistry microwave-assisted hydrothermal method at different reactor pressures. The x-ray diffraction analysis showed that single rutile SnO2 phase with tetragonal lattice structure formed. photoluminescence emission measured for He-Cd laser excitation 325 nm and it broad band from 400 to 800 all the spectra were due creation of various oxygen tin defects as confirmed photoelectron spectroscopy data. origin in NCs...
The preparation of a variety β-ketoesters was achieved in high yields from methyl acetoacetate under neutral conditions through the utilization magnetic CuFe<sub>2</sub>O<sub>4</sub>nanoparticles as catalyst.
An efficient and economical approach to functionalized furo[3,2-<i>c</i>]coumarin pyrano[3,2-<i>c</i>]coumarin derivatives has been developed from 4-hydroxy-3-(prop-2-ynyl)coumarin through organocatalysis or metallo-organocatalysis. Selective '5-<i>exo</i>-dig' '6-<i>endo</i>-dig' cyclization of the substrates could be achieved under organocatalytic {1,8-diazabicyclo[5.4.0]undec-7-ene} metallo-organocatalytic (<i>N</i>-methylmorpholine/CuBr) conditions, respectively, yield potentially...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox glycosidation: a new strategy for disaccharide synthesisAnthony G. M. Barrett, Barend C. B. Bezuidenhoudt, Alan F. Gasiecki, Amy R. Howell, and Mark A. RussellCite this: J. Am. Chem. Soc. 1989, 111, 4, 1392–1396Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.org/doi/10.1021/ja00186a037https://doi.org/10.1021/ja00186a037research-articleACS...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox glycosidation via thionoester intermediatesAnthony G. M. Barrett, B. C. Bezuidenhoudt, Amy R. Howell, Albert Lee, and Mark A. RussellCite this: J. Org. Chem. 1989, 54, 10, 2275–2277Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 1989https://pubs.acs.org/doi/10.1021/jo00271a008https://doi.org/10.1021/jo00271a008research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox glycosidation: a stereoselective synthesis of sucroseAnthony G. M. Barrett, Barend C. B. Bezuidenhoudt, and Laura MelcherCite this: J. Org. Chem. 1990, 55, 18, 5196–5197Publication Date (Print):August 1, 1990Publication History Published online1 May 2002Published inissue 1 August 1990https://pubs.acs.org/doi/10.1021/jo00305a008https://doi.org/10.1021/jo00305a008research-articleACS PublicationsRequest reuse permissionsArticle...
Epoxidation of a series polyoxygenated chalcones with H2O2 in the presence poly(α-amino acid) catalysts, followed by Lewis acid-catalysed phenylmethanethiol ring-opening and cyclization, afforded trans- cis-dihydroflavonols moderate to high enantiomeric excess yield.
The absolute configuration of (αR)-α,2′-dihydroxy-4,4′-dimethoxydihydrochalcone from the heartwood Pterocarpus angolensis D.C. is established. Its structure substantiated by synthesis and photochemical conversion its α-O-tosyl derivative into an α-tosyloxymethyldeoxybenzoin hence to α-methyldeoxybenzoin analogue. step also leads, amongst others, α-hydroxymethyldeoxybenzoin, β-hydroxydihydrochalcone, 2-benzylbenzofuran-3-one analogues depending on conditions photolysis.