MWF_16 - Organic Lecture Series CH 310/318 M LECTURE 16...

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Organic Lecture Series 1 CH 310/318 M LECTURE 16 Textbook Assignment: Chapter 6- Cont’d Today’s Topics: Alkenes Alkenes - Structure & Properties Structure & Properties Notice & Announcements: Pick up Papers in Undergrad Office Organic Lecture Series 2 Carbocations Carbocations Carbocation Carbocation : A species in which a carbon atom has only six electrons in its valence shell and bears a positive charge. Carbocations: 1. Are classified as 1°, 2°, or 3° depending on the number of carbons bonded to the carbon bearing the + charge. 2. Are electrophiles; that is, they are electron-loving. 3. Are Lewis acids.
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Organic Lecture Series 3 Carbocations Carbocations Carbocations: 4. Have bond angles of approximately 120° about the positively charged carbon. 5. Use sp 2 hybrid orbitals to form sigma bonds from carbon to the three attached groups. 6. The unhybridized 2 p orbital lies perpendicular to the sigma bond framework and contains no electrons. Organic Lecture Series 4 • The structure of the tert-butyl cation. Carbocations Carbocations
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Organic Lecture Series 5 – relative stability – Methyl and primary carbocations are so unstable that they are never observed in solution. Methyl cation (methyl) Ethy l cation (1°) Isopropyl cation (2°) tert -Butyl cation (3°) Increasing carbocation stability + ++ + C H H CH 3 C 3 3 H C 3 3 3 C H H H Carbocation Carbocation Stability Stability
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This note was uploaded on 10/10/2010 for the course CH 54600 taught by Professor Colorpart during the Fall '10 term at University of Texas at Austin.

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MWF_16 - Organic Lecture Series CH 310/318 M LECTURE 16...

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