dehydrogenation_hydration - Patricia Mora Chem 3BL 03/03/10...

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Patricia Mora Chem 3BL 03/03/10 Dehydrogenation and Hydrogenation In this experiment, we examined the reaction of monoterpene carvone with Pd/C and heat. In addition, we attempted to isolate the product of carvone and Pd/C by using acids and bases and by separating aqueous and organic layers. The purpose of this experiment was to determine the relative stability of isomeric alkenes through hydrogenation of alkenes with hydrogen gas and metal catalyst or transfer hydrogenation. During the transfer-hydrogenation reaction, Pd/C was dehydrogenated and donates hydrogen to carvone, resulting in the cyclohexane part of carvone becoming a benzene ring in the presence of heat. Gaining more hydrogens to create double bonds made the product more stable, and also aromatic. When the bonds are broken, energy is added to the reaction while forming bonds releases energy from the reaction. Two C-H bonds were broken (412 kJ/mol + 412 kJ/mol = +824 kJ/mol is added), A C=C double was broken (824 kJ/mol + 614 kJ/mol = +1438 kJ/mol added to reaction), AC=C double was formed (-
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This note was uploaded on 03/13/2011 for the course CHEM 3BL taught by Professor Chunmei during the Spring '08 term at University of California, Berkeley.

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dehydrogenation_hydration - Patricia Mora Chem 3BL 03/03/10...

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