PracticeQuestionsChap7

PracticeQuestionsChap7 - HBr (1 equiv) 1. BH 3 2. HOOH NaOH...

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1 Chem 2261 Checklist and Practice Questions for Chapter 7 ± Delocalized electrons ± Draw resonance structures for a given molecule. ± Distinguish between resonance structures and isomers. ± Indicate major and minor resonance contributors. ± Rank delocalized structures in order of stability. ± Effect of delocalization on reactivity. ± Reactions of conjugated dienes with electrophilic reagents ± Regiochemistry: 1,2-addition and 1,4-addition ± Hydrogen halide addition ± Delocalized allyl cation intermediate ± Kinetic vs. Thermodynamic Control ± Halogenation ± The Diels-Alder Reaction ± Requirements for reaction to take place ± Electron-withdrawing group on dienophile ± s-cis conformation of diene ± Stereoselectivity ± Syn addition to diene and dienophile ± Endo rule ± Regioselectivity
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Practice Questions for Quiz 3 and Exam 3 2 1. Draw the structure for the most stable carbocation for each molecular formula: C 4 H 9 + C 7 H 13 + 2. Draw the expected major product of each step in each of the following reaction sequence.
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Unformatted text preview: HBr (1 equiv) 1. BH 3 2. HOOH NaOH 3. (10 pts) Draw significant resonance contributors for the following structure. Identify the major resonance contributor(s). O + 4. (6 pts) Rank the following group of compounds in order of basicity using numbers 1-6 (1 = most basic; 6 = least basic) in the boxes below the compounds. N OMe N NMe 2 N NO 2 N Me N Me N NO 2 NO 2 Practice Questions for Quiz 3 and Exam 3 3 5. (20 pts, 4 pts ea) Provide the required diene and dienophile for each of the following Diels-Alder reactions. a) b) c) d) e) CO 2 Me CO 2 Me H H CN MeO N O O CO 2 Me CO 2 Me O O O H H H Practice Questions for Quiz 3 and Exam 3 4 6. (8 pts) Choose (circle) the major isomer produced in the following Diels-Alder reaction. OMe Me CN Me + OMe Me Me CN OMe Me CN Me OMe Me Me CN OMe Me CN Me OMe Me Me CN OMe Me CN Me OMe Me Me CN OMe Me CN Me OMe Me CN Me OMe Me CN Me OMe Me CN Me OMe Me CN Me OMe Me Me CN OMe Me Me CN OMe Me Me CN OMe Me Me CN...
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PracticeQuestionsChap7 - HBr (1 equiv) 1. BH 3 2. HOOH NaOH...

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