Studyguide for Ochem Lab Final

Studyguide for Ochem Lab Final - Lab Final Ochem Terms...

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Lab Final- Ochem Terms: Abbreviations TLC- Thin Layer Chromatography Rf- distance traveled by compound / distance traveled by solvent Retardation Factor IR- Infrared Spectroscopy GC- Gas Chromatography NMR- Nuclear Magnetic Resonance Spectroscopy E1- Elimination Unimolecular E2-Elimination Bimolecular Sn1- Substitution Nucleophilic Unimolecular Sn2- Substitution Nucleophilic Bimolecular Safety- 1. Methanol: flammable and poisonous liquid. Poisoning from ingestion, inhalation or absorption. Denatures alcohol 2. Petroleum: Very flammable 3. Hexanes- flammable 4. Methylene Chloride- harmful if swallowed 5. Hydrogen gas- flammable 6. Chlorinated Solvents- Kill the catalyst 7. Pd/C is flammable 8. Acetic Acid- Corrosive 9. Alcohol- flammable 10. Sulfuric Acid- corrosive Glass waste- silicon plate Enantiomer - Stereoisomers that are non-superimposable mirror images. Diastereomer - Stereoisomers that are not enantiomers.
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Lab Procedures Reflux is the process of boiling reactants while continually cooling the vapor returning it back to the flask as a liquid. It is used to heat a mixture for extended periods and at certain temperatures. -A condenser is attached to the boiling flask, and cooling water is circulated to condense escaping vapors. One should always use a boiling stone or a magnetic stirrer to keep the boiling solution from "bumping - Reflux Condenser: Distillation. It cooled the vapor back to liquid. The advantage was that it could be left for a period of time without adding mores solvent. Steam distillation -Steam distillation is a special type of distillation (a separation process ) for temperature sensitive materials like natural aromatic compounds. - Used in “ Isolation of Limonene ” lab - uses steam distillation to isolate limonene from citrus fruit, and analyze by GC - GC reading, IR reading, R/S configuration, optical activity with polarimeter, and specific rotation: [α] = α / cl, where α is the observed rotation in degrees, c is the concentration/density, l the path length in dm - The final limonene product had a refractive index of 1.466, which was similar to
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