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Tutorial%204Q - be useful practice for you as this type of...

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CHEM 281 Tutorial Problem Set No. 4 1. In class it was mentioned that E and Z isomers of alkenes have a barrier to interconversion of approximately 63 kcal/mol and, consequently, can be considered configurationally stable. However, in biological systems the isomerization (or E/Z interconversion) of alkenes may occur readily and plays an important role in many biological processes. Can you briefly describe the Z to E interconversion of Z-retinal and what role this plays in our ability to see? 2. Please name the following molecules and draw them in their most stable (chair) conformations. Highlight steric interactions (if any) in this conformation. This should
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Unformatted text preview: be useful practice for you as this type of question caused the most difficulties on the midterm. 3. Please name the following molecules. 4. Please arrange the following molecules in order of stability (most stable to least stable). 5. Please name the first two of following molecules and draw all possible resonance contributors for each. Circle the resonance structure that you feel would be the least stable. Show all relevant arrows used to convert between resonance structures. a) b) c) d) OH O name name O a) b) c) d) e) OH HO a) b) c) d)...
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