lec 3 - Structural Formulas Chem 221 Wednesday July 13,...

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Structural Formulas Chem 221 Wednesday July 13, 2011
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The Structural Theory of Organic Chemistry Number of covalent bonds usually formed by some elements typically encountered in organic compounds Element # of covalent bonds Element # of covalent bonds H 1 F 1 C 4 Cl 1 N 3 (or 4) Br 1 O 2 I 1
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Thus C is tetravalent O is divalent H and halogens are monovalent
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Important: Do not draw any structure with more than 4 bonds on a carbon
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3 bonds on carbon need a charge on carbon
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Oxygen Usually divalent
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Lone pair electrons on oxygen can donate electrons to a Lewis acid 3 bonds on oxygen (with a positive charge on oxygen) empty p-orbitals
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One bond on oxygen Usually need a negative charge on oxygen
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How to Interpret and Write Structural Formulas
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Representations of Structural Formulas There are a number of ways to write structural formulas. Each conveys some idea or information about the structure. Dot Structures (Lewis Structures)
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This note was uploaded on 08/06/2011 for the course CHEM 221x taught by Professor Broyer during the Summer '11 term at USC.

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lec 3 - Structural Formulas Chem 221 Wednesday July 13,...

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