Chem241a_Lecture_8 - Organic Chemistry 241a Prof. Bogdan...

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Or ganic Chemistry 241a Prof. Bogdan Olenyuk Contact Information Office: Old Chemistry 309 olenyuk@email.arizona.edu Phone: (520) 626-0754 Course web site: http://www.chem.arizona.edu/courseweb/074/CHEM241A1_2/FrameSet.html
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Chapter 2: Polar Covalent Bonds: Acids and Bases Organic acids and organic bases Acids and bases: the Lewis definition Noncovalent interactions Alkanes and their isomers Naming of Alkanes Today we will cover: Reading Assignment: McMurry (the BOOK), Ch. 2.9 – 2.13, 3.1 – 3.2
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Organic Acids and Organic Bases • Organic Acids: - characterized by the presence of positively polarized hydrogen atom
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Organic Acids • Those that lose a proton from O–H, such as methanol and acetic acid • Those that lose a proton from C–H, usually from a carbon atom next to a C=O double bond (O=C–C–H)
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Organic Bases • Have an atom with a lone pair of electrons that can bond to H + • Nitrogen-containing compounds derived from ammonia are the most common organic bases • Oxygen-containing compounds can react as bases when with a strong acid or as acids with strong bases
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Acids and Bases: The Lewis Definition • Lewis acids are electron pair acceptors and Lewis bases are electron pair donors • Brønsted acids are not Lewis acids because they cannot accept an electron pair directly (only a proton would be a Lewis acid) • The Lewis definition leads to a general description of many reaction patterns but there is no scale of strengths as in the Brønsted definition of p K a
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Lewis Acids and the Curved Arrow Formalism The Lewis definition of acidity includes metal cations, such as Mg 2 +
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This note was uploaded on 08/23/2008 for the course CHEM 241A taught by Professor Olenyuk during the Fall '07 term at University of Arizona- Tucson.

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Chem241a_Lecture_8 - Organic Chemistry 241a Prof. Bogdan...

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