alken gc- col - 10/23/2007 Dehydration of...

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10/23/2007 Dehydration of 2-Methylcyclohexanol and Analysis of an Alkene Mixture of GC Introduction: Alcohol dehydration is an acid catalyzed reaction, which can be preformed by strong, concentrated mineral acids such as phosphoric acid. Water will be eliminated from the molecule with calcium chloride and a C=C double bond will be formed. If the alcohol is not symmetric, then a mixture of products containing alkenes isomers is possible. Russian chemist Saytzev predicted for that a reaction following mechanism, the more substituted C=C is favored in the product. In the case of 2-methylcyclohexanol, that would mean that 1-methylcyclohexane should be formed as the major product and 3-methylyclohexane should be formed as minor. Therefore, in this experiment will carry out the dehydration of 2-methylcyclohexane in H 3 PO 4 and analyze the purity and composition distribution of alkenes products on gas chromatography. The gas chromatography is used to separate the two isomeric alkenes produced from the reaction. The equipment to be used consists of 1.25 mL 2-methylcyclohexanol, a magnetic spin vane, a hot plate, and aluminum block, 2 5-mL conical vials, 0.25 mL 85% phosphoric acid, a Hickman still, a condenser,
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This note was uploaded on 04/13/2008 for the course CH 237 taught by Professor Nikles during the Spring '08 term at University of Alabama at Birmingham.

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alken gc- col - 10/23/2007 Dehydration of...

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