StudentNotes-Section8

StudentNotes-Section8 - Section 8 Dienes and Conjugated...

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Section 8 – Dienes and Conjugated Systems 102 Section 8 – Dienes & Conjugated Systems 8.1 Structure and Properties of Dienes 8.1.1 Conjugation Dienes are compounds that contain two double bonds. These double bonds may exist in three different configurations: 8.1.2 Preparation of Dienes Dienes may be prepared by the following methods: Via allylic bromination and elimination NBS CCl 4 , h ν Br K t BuO t BuOH Dehydration of diols (elimination) OH OH Al 2 O 3 +2 H 2 O Catalytic dehydrogenation Al 2 O 3 /Cr 2 O 3 600 o C Note that the formation of conjugated dienes is a favored process – conjugated dienes are more stable.
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Section 8 – Dienes and Conjugated Systems 103 8.1.3 Stability of Dienes We may determine the relative stability of dienes on the basis of their heats of hydrogenation (cf. heats of hydrogenation of alkenes, Section 4).
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Section 8 – Dienes and Conjugated Systems 104 8.2 Reactions of Dienes 8.2.1 Electrophilic Addition to Dienes Compare the electrophilic addition reactions of alkenes, and non-conjugated dienes.
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This note was uploaded on 10/28/2010 for the course CHEM 235 taught by Professor Dr.poole during the Spring '10 term at Ball State.

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StudentNotes-Section8 - Section 8 Dienes and Conjugated...

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