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- Rank the following compounds from least to most stable. Least stable Most stable| 16. Which conformation of cyclohexane experiences the most transannular strain? a. chair b. planar c. boat d. twist boat e. All of these are stable. basdIdentify the highest and lowest energy conformation. If multiple energy conformations are degenerate, choose only one. Et H. Et Et H. H. MeEt Lowest Energy Me Highest Energy Et H. Et H. Et H. H- H. MeEt Highest Energy Me Lowest Energy Et H. Me H. Me C H H H. Me MeEt Highest Energy Lowest Energy Et H. Me Me H. H H Ме MeEt Lowest Energy Highest Energy OA OB OD
- 4. Now it's your turn. Using 3 as a template, draw the following molecules in their most stable conformation. You do not have to draw the least stable conformation, unless you find it helpful practice. a. b. C. d. Jo LOH Me § CI C/*** Br OH H HO... sop C/ = Mea.Draw the most stable conformation of trans-1,2-dimethylcyclohexane. b. Draw the most stable conformation of cis-1,2-dimethylcyclohexane.Classify each compound as identical to A or its enantiomer. CHO CHO H OH CHO a. CH,CH-C--OH CumCH,CH3 H OH b. d. HO C. ČH,CH3 н он CH;CH CHO CHO A
- 8) Identify enantiomers. C E A CI H ICL F CI H Cle H. CI H. CI H CI CI H. F H. 'F 'F H. F H H. F H H H. A) B and D, A and C B) B and D C) A and B, A and D, B and C, C and D D) B and D, A and B, A and D, B and C, C and D E) A and CCompare the following conformers of 1-fluoropropan-1-ol. Match each conformer to their corresponding relative energy. Recall, the more stable the conformer the lower the energy. OH CH3 'F 2. HOH 2nd Highest Energy H 2nd Lowest Energy H3C 3. H. ОН Lowest Energy H 'F Highest Energy ČH3 4. H3C, OH 'F 1. >4. Draw the most and least stable conformations of the following substituted cyclohexanes in the chair format (excluding transient conformations like half chair, twist boat and boat). Br BL Br Br
- Neuroprotectin D1 (NPD1) is synthesized in the body from highly unsaturated essential fatty acids. NPD1 is a potent natural anti-inflammatory agent.a.Label each carbon–carbon double bond as conjugated or isolated. b.Label each double bond as E or Z. c.For each conjugated system, label the given conformation as s-cis or s-trans.Which conformer of pentane is the least stable? CH2CH3 CH,CH3 CH,CH, CH3 HCH,CH; CH H. H H. CH3 H. H. CH3 II III IV Select one: O IV O IIDraw a stereoisomer of cis-1,2-dimethylcyclohexane. (Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.) • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • In cases where there is more than one answer, just draw one. Y TAYY n[] ChemDoodle