Gas Chromatography

Gas Chromatography - Gloria Park, Hye Oh Gas Chromatography...

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Gloria Park, Hye Oh Gas Chromatography Purpose: The purpose of this experiment was to perform acid-catalyzed dehydration of 2-methylcyclohexanol using simple distillation, which can produce 1- methylcyclohexene and 3-methylcyclohexene. The course of the reaction was determined by performing gas chromatography and tests for unsaturation. Abstract: Introduction: Alcohol dehydration is a method of introducing unsaturation into an organic compound. Dehydration of an alcohol usually goes by E1 mechanisms. Alcohols can be dehydrated by using an acid-catalyst such as phosphoric acid. The reaction usually results in the formation of alkenes. Using Zaitsev’s rule, which states that the more highly substituted alkene product will be preferentially formed, the major product can be predicted. In other words, the more stable product will be formed. Gas chromatography is used to analyze the products of the dehydration. It is the separation based on the distribution of two or more compounds between two phases, one of which is stationary (liquid) and one of which is moving (a gas). The stationary phase is usually a wax-like material consisting of long-chain hydrocarbons, silicone oil, or polymeric ethers coated on finely divided SiO 2 . The moving phase is usually helium (He 2 ) or nitrogen (N 2 ). Further analysis of the product is done by testing for unsaturation or the presence of alkenes. Alkenes are unsaturated because they are able to add a hydrogen when a C=C double bond is broken. A solution of bromine in methylene chloride and a solution of potassium permanganate are used. The
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This note was uploaded on 08/01/2008 for the course CHEM 241L taught by Professor Hunt during the Spring '08 term at UVA.

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Gas Chromatography - Gloria Park, Hye Oh Gas Chromatography...

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