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Diels-Alder Visualization Several computer animations of a Diels-Alder reaction that were created as an undergraduate student project are presented.
Addition Reactions |
Alkenes
Addition Reactions of Alkenes The Diels-Alder reaction, addition of oxygen to tetrakis(N, N-dimethylamino) ethylene, polymerization of ethylene, and addition of iodine to a-pinene are demonstrated. Molecular models of ethene are shown.
The Synthesis of N-Benzyl-2-azanorbornene via Aqueous Hetero Diels–Alder ReactionXavier Sauvage and Lionel Delaude Characterization of the product of this organic synthesis through IR and NMR data analysis provides valuable material to familiarize students with different types of protonproton coupling patterns and their typical ranges, serves to illustrate the concepts of green chemistry and atom efficiency, and can be used to exemplify structural analysis and computational studies. Sauvage, Xavier; Delaude, Lionel. J. Chem. Educ.2008, 85, 1538.
Alkenes |
Aqueous Solution Chemistry |
Conformational Analysis |
Green Chemistry |
IR Spectroscopy |
Molecular Modeling |
NMR Spectroscopy |
Stereochemistry |
Synthesis
The Aromaticity of Pericyclic Reaction Transition StatesHenry S. Rzepa Presents an approach that combines two fundamental concepts in organic chemistry, chirality and aromaticity, into a simple rule for stating selection rules for pericyclic reactions in terms of achiral Hckel-aromatic and chiral Mbius-aromatic transition states. Rzepa, Henry S. J. Chem. Educ.2007, 84, 1535.
Alkanes / Cycloalkanes |
Alkenes |
Aromatic Compounds |
Mechanisms of Reactions |
Stereochemistry
The Mechanism of Covalent Bonding: Analysis within the Hückel Model of Electronic StructureSture Nordholm, Andreas Bäck, and George B. Bacskay Hckel molecular orbital theory is shown to be uniquely useful in understanding and interpreting the mechanism of covalent bonding. Using the Hckel model it can be demonstrated that the dynamical character of the molecular orbitals is related simultaneously to the covalent bonding mechanism and to the degree of delocalization of the electron dynamics. Nordholm, Sture; Bäck, Andreas; Bacskay, George B. J. Chem. Educ.2007, 84, 1201.
Interactive Molecular OrbitalsWilliam F. Coleman The majority of Introductory Chemistry texts provide students with an adequate introduction to the visual aspects of the molecular orbital model for homonuclear diatomic molecules. The treatment of heteronuclear diatomic and polyatomic molecules is less uniform. Heteronuclear diatomics, when mentioned, are invariably treated as being derived from homonuclear diatomics. While the atomic orbital energy level differences in heteronuclear diatomics is sometimes pictured, the consequences of those differences for the resultant molecular orbitals are rarely discussed. The discussion of polyatomic molecular orbitals in these texts is limited to showing that parallel p-orbitals produce delocalized pi molecular orbitals. The molecules typically mentioned in this context are benzene, nitrate ion and carbonate ion. However, It is rarely pointed out that the six p-orbitals in benzene would form 6 pi molecular orbitals, and that only one of these orbitals would look like the picture in the text.These interactive modules are designed to clarify this subject.
MO Theory
Molecular OrbitalsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
MO Theory |
Magnetic Properties
Delocalized ElectronsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
