September 17

September 17 - Lecture #10, September 17, 2008...

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Lecture #10, September 17, 2008 Announcements (1) Quiz #2: September 15-19 Material tested includes information through Friday’s (September 12) lecture (2) Please download gapped lecture notes on Stereochemistry (Chapter 7) for lecture (3) Exam 1 on Thursday, September 25 will cover material through Friday’s (September 19) lecture. Omit Chapter 3.13-3.15 (for now) Last name A-Ha: HUM 150 Last name He-Z: HUM 1B50 ConcepTest (CT) Which compound would have the highest Δ H comb ? A) Methylcyclobutane B) Cyclopentane C) cis -1,2-dimethylcyclopropane D) trans -1,2-dimethylcyclopropane Conformational analysis of monosubstituted cyclohexanes: Lecture #10, Sept. 17, 2008 CH 3 CH 3 5% 95% H H H H H is a symbol that refers to steric strain between two atoms or groups 1 2 3 2' 3' van der Waals strain in axial methylcyclohexane: Same interaction as gauche butane. ... therefore an energy cost of 0.8 x 2 = 1.6 kcal/mol (experimental: 1.7 kcal/mol) Newman projection for the 1,3 diaxial interaction in axial methylcyclohexane:
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September 17 - Lecture #10, September 17, 2008...

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