dehydrogenation - Na Hye Eunice Kim (#19513926) Chem 3BL...

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Na Hye Eunice Kim (#19513926) Chem 3BL (Jessica’s) October 13, 2009 A Dehydrogenation/Hydrogenation Reaction In this experiment, .15mL of (R) – carvone was reacted with 26mg of Pd/C, a black powder, in heat and was dehydrogenated and donated hydrogen to hydrogenate the intermediate. Hydrogenation and dehydration can be used to obtain a saturated compound like a benzene ring and other aromatic compounds with defined substitution patterns. It is important to acknowledge that the driving force of the whole process is the resonance stability of aromatic product and that the heat of hydrogenation can be used to determine the relative stability of isomeric alkenes. Because the stability of aromatic product, the benzene ring is formed and hydrogens removed were added to the terminal alkene to form a normal alkane and to oxygen part to form an alcohol. Thus, the structure of the product was a benzene ring with a methyl, an isopropyl, and an alcohol group as substitutions. The overall reaction was exothermic. First of all, the heat of bond formation from the dehydrogenation of 1,3-hexadiene to benzene was -24 kJ/mol and the heat of bond broken from the hydrogenation of terminal alkene was -126 kJ/mol.
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This note was uploaded on 11/23/2009 for the course CHEM 3BL taught by Professor Chunmei during the Summer '08 term at Berkeley.

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dehydrogenation - Na Hye Eunice Kim (#19513926) Chem 3BL...

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