Koofers

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Videos 21 - 40 of 489
 
49:27
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The lecture opens with tricks (Z-effective and Self Consistent Field) that allow one to correct approximately for the error in using orbitals that is due to electron repulsion. This error is hidden by..
Author: J Michael McBride Views: 3
 
50:35
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This lecture begins by applying the united-atom plum-pudding view of molecular orbitals, introduced in the previous lecture, to more complex molecules. It then introduces the more utilitarian concept ..
Author: J Michael McBride Views: 3
 
49:44
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Professor McBride uses this lecture to show that covalent bonding depends primarily on two factors: orbital overlap and energy-match. First he discusses how overlap depends on hybridization; then how ..
Author: J Michael McBride Views: 7
 
47:36
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This lecture brings experiment to bear on the previous theoretical discussion of bonding by focusing on hybridization of the central atom in three XH3 molecules. Because independent electron pairs mus..
Author: J Michael McBride Views: 2
 
47:12
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Professor McBride begins by using previous examples of pathological bonding and the BH3 molecule to illustrate how a chemist's use of localized bonds, vacant atomic orbitals, and unshared pairs to und..
Author: J Michael McBride Views: 4
 
50:08
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This lecture continues the discussion of the HOMO/LUMO view of chemical reactivity by focusing on ways of recognizing whether a particular HOMO should be unusually high in energy (basic), or a particu..
Author: J Michael McBride Views: 3
 
41:44
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Continuing the examination of molecular orbital theory as a predictor of chemical reactivity, this lecture focuses on the close analogy among seemingly disparate organic chemistry reactions: acid-base..
Author: J Michael McBride Views: 3
 
51:21
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This lecture completes the first half of the semester by analyzing three functional groups in terms of the interaction of localized atomic or pairwise orbitals. Many key properties of biological polyp..
Author: J Michael McBride Views: 6
 
47:10
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This lecture begins a series describing the development of organic chemistry in chronological order, beginning with the father of modern chemistry, Lavoisier. The focus is to understand the logic of t..
Author: J Michael McBride Views: 0
 
50:01
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This lecture traces the development of elemental analysis as a technique for the determination of the composition of organic compounds beginning with Lavoisier's early combustion and fermentation expe..
Author: J Michael McBride Views: 2
 
49:22
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The most prominent chemist in the generation following Lavoisier was Berzelius in Sweden. Together with Gay-Lussac in Paris and Davy in London, he discovered new elements, and improved atomic weights ..
Author: J Michael McBride Views: 2
 
49:15
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Work by W?hler and Liebig on benzaldehyde inspired a general theory of organic chemistry focusing on so-called radicals, collections of atoms which appeared to behave as elements and persist unchanged..
Author: J Michael McBride Views: 0
 
48:47
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Youthful chemists Couper and Kekul? replaced radical and type theories with a new approach involving atomic valence and molecular structure, and based on the tetravalence and self-linking of carbon. V..
Author: J Michael McBride Views: 1
 
50:15
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Half a century before direct experimental observation became possible, most structures of organic molecules were assigned by inspired guessing based on plausibility. But Wilhelm K?rner developed a str..
Author: J Michael McBride Views: 2
 
49:02
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Despite cautions from their conservative elders, young chemists like Patern? and van't Hoff began interpreting molecular graphs in terms of the arrangement of a molecule's atoms in 3-dimensional space..
Author: J Michael McBride Views: 3
 
48:26
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With his tetrahedral carbon models van't Hoff explained the mysteries of known optical isomers possessing stereogenic centers and predicted the existence of chiral allenes, a class of molecules that w..
Author: J Michael McBride Views: 3
 
51:36
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It is important that chemists agree on notation and nomenclature in order to communicate molecular constitution and configuration. It is best when a diagram is as faithful as possible to the 3-dimensi..
Author: J Michael McBride Views: 2
 
47:30
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Determination of the actual atomic arrangement in tartaric acid in 1949 motivated a change in stereochemical nomenclature from Fischer's 1891 genealogical convention (D, L) to the CIP scheme (R, S) ba..
Author: J Michael McBride Views: 5
 
50:19
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Within a lecture on biological resolution, the synthesis of single enantiomers, and the naming and 3D visualization of omeprazole, Professor Laurence Barron of the University of Glasgow delivers a gue..
Author: J Michael McBride Views: 3
 
50:43
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The chemical mode of action of omeprazole is expected to be insensitive to its stereochemistry, making clinical trials of the proposed virtues of a chiral switch crucial. Design of the clinical trials..
Author: J Michael McBride Views: 2
Videos 21 - 40 of 489
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