Posts Tagged ‘aqueous solution’
Saturday, December 31st, 2016
My holiday reading has been Derek Lowe’s excellent Chemistry Book setting out 250 milestones in chemistry, organised by year. An entry for 1920 entitled hydrogen bonding seemed worth exploring in more detail here.
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Tags:10.1021, aqueous solution, Chemical bond, chemical bonding, Chemistry, Derek Lowe, Hydrogen, Hydrogen bond, Intermolecular forces, Lowe's, Nature, Supramolecular chemistry
Posted in Historical | 2 Comments »
Saturday, December 24th, 2016
The previous posts produced discussion about the dipole moments of highly polar molecules. Here to produce some reference points for further discussion I look at the dipole moment of glycine, the classic zwitterion (an internal ion-pair).
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Tags:aqueous solution, Chemical polarity, Chemistry, dielectric, Dipole, Electric dipole moment, Electromagnetism, Magnetism, Moment, Nature, Physical quantities, Physics, Potential theory, zwitterion
Posted in crystal_structure_mining, Interesting chemistry | 1 Comment »
Wednesday, January 20th, 2016
The original strategic objective of my PhD researches in 1972-74 was to explore how primary kinetic hydrogen isotope effects might be influenced by the underlying structures of the transition states involved. Earlier posts dealt with how one can construct quantum-chemical models of these transition states that fit the known properties of the reactions. Now, one can reverse the strategy by computing the expected variation with structure to see if anything interesting might emerge, and then if it does, open up the prospect of further exploration by experiment. Here I will use the base-catalysed enolisation of 1,3-dimethylindolin-2-ones and the decarboxylation of 3-indole carboxylates to explore this aspect.
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Tags:aqueous solution, Brian Challis, can construct quantum-chemical models, computed free energy barrier matches, Dan Singleton, free energy barrier, free energy barriers, Kinetic isotope effect, Organic chemistry, Physical organic chemistry, quantum-chemical models, supervisor
Posted in reaction mechanism | No Comments »
Sunday, April 12th, 2015
Sodium borohydride is the tamer cousin of lithium aluminium hydride (LAH). It is used in aqueous solution to e.g. reduce aldehydes and ketones, but it leaves acids, amides and esters alone. Here I start an exploration of why it is such a different reducing agent.
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Tags:aqueous solution, Chemical bond, chemical bonding, Chemistry, Electronic effect, energy, final product, free energy barrier, Hydride, Hydrogen bond, immediate product, Lithium aluminium hydride, reduction
Posted in reaction mechanism | 2 Comments »
Monday, September 7th, 2009
The science journal is generally acknowledged as first appearing around 1665 with the Philosophical Transactions of the Royal Society in London and (simultaneously) the French Academy of Sciences in Paris. By the turn of the millennium, around 10,000 science and medical journals were estimated to exist. By then, the Web had been around for a decade, and most journals had responded to this new medium by re-inventing themselves for it. For most part, they adopted a format which emulated paper (Acrobat), with a few embellishments (such as making the text fully searchable) and then used the Web to deliver this new reformulation of the journal. Otherwise, Robert Hooke would have easily recognized the medium he helped found in the 17th century.
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Tags:A. I. Magee, A. Jana, A. P. Dove, Acrobat, American Chemical Society, aqueous solution, Balasundaram Lavan, C. S. M Allan, C. Wentrup, Chemical IT, chemical plugin, Chemoinformatics, Colorado, D. A. Widdowson, D. C. Braddock, D. J. Williams, D. R. Carbery, D. Scheschkewitz, Dalton Trans, digital Acrobat, E. H. Smith, E. M. Barreiro, E. W. Tate, Enhance Chemical Electronic Publishing, Extrusion Reactions, F. Diederich, F. Santoro, French Academy, G. Siligardi, G. Stammler, Ge, H. S. Rzepa, HTML, I. Omlor, I. Pavlakos, Interchange Apical, Interesting chemistry, Ion-Pair Mechanisms, β-diketiminate metal alkoxides, J. Clarke, J. Jana, J. L. Arbour, J. Lorenzo Alonso-Gómez, J. P. White, J. R. Arendorf, journal editor, K. K. (Mimi) Hii, K. P. Tellmann, King, Kuok Hii, L. A. Adrio, L. Johannissen, Lewis Base Catalyst, M. E. Cass, M. Hii, M. J. Cowley, M. J. Fuchter, M. J. Harvey, M. J. Humphries, M. J. Porter, M. Jakt, M. R. Crittall, M. Ritzefeld, M. Weimar, Marshall, Michael Wright, N. Berova, N. Harada, N. J. Mason, N. Mason, N. Masumoto, O. Casher, opendata, P. G. Pringle, P. Jutzi, P. Lo, P. Seiler, Paris, Peter Murray-Rust, polymerization, Porter, printing, R. B. Moreno, R. M. Williams, R. Schleyer, R. Wilhelm, Rappaport, RDF, representative, Robert Hooke, Royal Society in London, S. Díez-González, S. Lai, S. M. Allan, S. Martin-Santamaria, Sonsoles Martên-Santamarêa, Square Pyramidal Molecules, T. Lanyon-Hogg, the Philosophical Transactions of the Royal Society, V, V(III) Co, V. C. Gibson, V. Huch, V. W. Pike, W. B. Motherwell, Web Application, Web Table, XML, XSLT, Ya-Pei Lo
Posted in Chemical IT, Interesting chemistry | 6 Comments »