ASUC chem 03 - CHEMISTRY 3B Professor Peter Vollhardt...

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CHEMISTRY 3B Professor Peter Vollhardt 9/4/08 Lecture 3 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. LECTURE: BENZENE Last time, we ended with a discussion of cyclohexatriene, more commonly known as benzene. Today, we will take a look at some of the reactions involved with benzene. As we said last time, benzene is special because it is a cyclic array of six electrons that has special stability, called aromaticity . This makes it relatively inert to catalytic hydrogenation, electrophiles, and oxidants. PERICYCLIC REACTIONS The first important transformation for conjugated systems we will look at are pericyclic reactions . Particularly, the Diels-Alder reaction , a [4+2] cycloaddition. The Diels-Alder reaction is chemoselective,
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ASUC chem 03 - CHEMISTRY 3B Professor Peter Vollhardt...

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