(10-15-07) hydro dehydro

(10-15-07) hydro dehydro - Arthur Yu Chem 3BL 113,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Arthur Yu Chem 3BL 113, Genevieve van de Bittner Dehydrogenation and Hydrogenation Discussion: Based on the lab name, we know something is being hydrogenated and something dehydrogenated. Pd/C is a reagent that can use molecular hydrogen to hydrogenate double bonds, as well as perform hydrogen transfer reactions. In this lab, it was expected that carvone tautomerized to the enol form, then was dehydrogenated on its ring to yield the very stable benzene ring. Where would these extra 2H go? It could either hydrogenate the 1-2 double bond on another carvone’s ring or the double bond on the 5’ attached alkyl. But since it is more favorable to make an aromatic with carvone’s ring instead of hydrogenating the double bond, the H would hydrogenate the 5’ alkyl’s double bond. Let’s calculate approx. delta H (hereby referred to as dH) for this rxn: delta H total = d-H new bonds formed + d-H old bonds broken = (dehydrogenate 1,3-hexadiene to benzene) 1 + (hydrogenate terminal monosubstitued alkene)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2008 for the course CHEM 3BL taught by Professor Chunmei during the Fall '08 term at Berkeley.

Page1 / 3

(10-15-07) hydro dehydro - Arthur Yu Chem 3BL 113,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online