Lecture Description
Modern spectroscopic tools show not only the constitution, configuration, and conformation of glucose but also how it interconverts between isomeric hemiketal pyranose rings. One of mankind's great accomplishments was determinining its constitution and especially its configuration before such spectroscopy. By 1887 Heinrich Kiliani had established the constitution of glucose as an aldohexose, and with help from Emil Fischer, he developed a method for homologating aldoses. Fisher assembled a great deal of experimental evidence on interconversion of natural and artificial aldoses, and their derivatives, especially their crystalline osazones. In 1892 he used this evidence to prove logically which of eight aldohexose configurations corresponds to glucose and to provide definitive support for van't Hoff's stereochemical theory. In 1991 Cram, Tanner, and Thomas reported the NMR spectrum of antiaromatic cyclobutadiene, which they prepared by photolysis inside a clamshell molecule that they designed and constructed in order to isolate this highly reactive molecule.
Course Index
- Mechanism: How Energies and Kinetic Order Influence Reaction Rates
- Peculiar Rate Laws, Bond Dissociation Energies, and Relative Reactivities
- Rate and Selectivity in Radical-Chain Reactions
- Electronegativity, Bond Strength, Electrostatics, and Non-Bonded Interactions
- Solvation, H-Bonding, and Ionophores
- Brønsted Acidity and the Generality of Nucleophilic Substitution
- Nucleophilic Substitution Tools - Stereochemistry, Rate Law, Substrate, Nucleophile, Leaving Group
- Solvent, Leaving Group, Bridgehead Substitution, and Pentavalent Carbon
- Pentavalent Carbon? E2, SN1, E1
- Cation Intermediates - Alkenes: Formation, Addition, and Stability
- Carbocations and the Mechanism of Electrophilic Addition to Alkenes and Alkynes
- Nucleophilic Participation During Electrophilic Addition to Alkenes: Halogen, Carbene, and Borane
- Addition to Form Three-Membered Rings: Carbenoids and Epoxidation
- Epoxide Opening, Dipolar Cycloaddition, and Ozonolysis
- Metals and Catalysis in Alkene Oxidation, Hydrogenation, Metathesis, and Polymerization
- Isoprenoids, Rubber, and Tuning Polymer Properties
- Alkynes; Conjugation in Allylic Intermediates and Dienes
- Linear and Cyclic Conjugation Theory; 4n+2 Aromaticity
- Aromatic Transition States: Cycloaddition and Electrocyclic Reactions
- Electronic and Vibrational Spectroscopy
- Functional Groups and Fingerprints in IR Spectroscopy; Precession of Magnetic Nuclei
- Medical MRI and Chemical NMR
- Diamagnetic Anisotropy and Spin-Spin Splitting
- Higher-Order Effects, Dynamics, and the NMR Time Scale
- C-13 and 2D NMR - Electrophilic Aromatic Substitution
- Aromatic Substitution in Synthesis: Friedel-Crafts and Moses Gomberg
- Triphenylmethyl and an Introduction to Carbonyl Chemistry
- Mechanism and Equilibrium of Carbonyl Reactions
- Imines and Enamines; Oxidation and Reduction
- Oxidation States and Mechanisms
- Periodate Cleavage, Retrosynthesis, and Green Chemistry
- Measuring Bond Energies: Guest Lecture by Prof. G. Barney Ellison
- Green Chemistry; Acids and Acid Derivatives
- Acids and Acid Derivatives
- Acyl Insertions and a-Reactivity
- α-Reactivity and Condensation Reactions
- Proving the Configuration of Glucose and Synthesizing Two Unnatural Products
- Review: Synthesis of Cortisone
Course Description
This is a continuation of Freshman Organic Chemistry I (CHEM 125a), the introductory course on current theories of structure and mechanism in organic chemistry for students with excellent preparation in chemistry and physics. This semester treats simple and complex reaction mechanisms, spectroscopy, organic synthesis, and some molecules of nature.