Recitation__2_Sept_2 - Organic Recitation #2 September 2,...

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Organic Recitation #2 September 2, 2007 Chemistry 357 - Qatar Organic Chemistry for the Life Sciences Recitation Exercises 1. Using curved-arrow notation, show how electrons in the left structure move to produce the second resonance structure. For each example, provide the resonance hybrid that reflects the overall bonding picture including partial charges where necessary. In each example, the second resonance structure is a MORE IMPORTANT CONTRIBUTOR to the resonance hybrid structure and thus, the properties of the species. Explain the reason(s) why? a) H C C H O C H H resonance hybrid H C C H O C H H Explanation: b) resonance hybrid C N N H H H C N N H H H Explanation: c) resonance hybrid H C C H O H H C C H O H : : Explanation: d) resonance hybrid H H O H H H O H : Explanation:
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2. Complete all the structures below by first adding all lone pair electrons necessary to account for the formal charge designated. Then use standard curved-arrow notation to indicate the “flow of electrons” necessary to give the products shown.
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This note was uploaded on 03/29/2009 for the course CHEM 3570 taught by Professor Ganem, b during the Fall '06 term at Cornell University (Engineering School).

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Recitation__2_Sept_2 - Organic Recitation #2 September 2,...

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