Lecture 25 - trans retinol which comes from β-carotene 2...

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1 Reading for Wednesday Chapter 22: 22.1-22.4, 22.6-22.8 ARIS Quiz #5 Available Wednesday March 30 Due Sunday April 3 at 11:59 pm Mon. 6:00-7:30 pm MAL 3092 Tues. 2:30-4:00 PM MAL 2007 Wed. 5:00-6:30 PM MAL 2001 Thurs. 9:30-10:50 AM MAL 1003 Sat. 11:30 AM-1:00 PM MAL 2007 PLUS Sessions THIS WEEK Imines (21.11) Formed in reaction between a 1º amine and an aldehyde or ketone Requires mild acidic conditions C=O converted to C=N Reaction reverses in strong acid Scanning Electron Micrograph of a Retina Rhodopsin: an imine involved in vision Rhodopsin is synthesized by the rod cells of the eye from 11- cis -retinal and a 1° amine in the protein opsin. Retinal is derived from Vitamin A (all-
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Unformatted text preview: trans retinol), which comes from β-carotene 2 Enamines (21.12) • Formed in reaction between a 2º amine and an aldehyde or ketone • Requires mild acidic conditions •-CRH-C=O converted to -RC=C-NR 2 • Reaction reverses in strong acid Hydrates (21.13) • Formed from reaction of water with a ketone or aldehyde • Catalyzed by acid or base • Amount of hydrate depends on structure of aldehyde or ketone Acetals (21.14) • Formed from rxn. of a ketone or aldehyde with 2 equiv. of an alcohol • Catalyzed by acid • Must remove H 2 O as it is formed (Le Chatelier’s Principle) Dean-Stark Trap...
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This note was uploaded on 10/24/2011 for the course CHEMISTRY 623 taught by Professor Benson during the Spring '11 term at Kansas.

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Lecture 25 - trans retinol which comes from β-carotene 2...

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