mmi - E XPE RI M E N T : M O L E CUL AR M ODE L ING I: C O...

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E X P E R I M E N T : M O L E C U L A R M O D E L I N G I : C O N F O R M A T I O NS A N A L YSIS & P R O P E R T I ES Name _______________________________________ Instructor ____________________________________ Date ________________________________________ Laboratory Questions These questions are to be completed and turned in at the beginning of the pre-lab period. PR E- L A B Q U ES T I O NS 1. Examine the diagram of conformational energies for butane shown in the McMurry textbook (Figure 3.9). Which conformation(s) would represent a local minimum and which would represent a global minimum? 2. McMurry indicates that the gauche conformation (60 dihedral angle) of butane results in steric strain because of repulsion between the two methyl groups (p 96). a. Explain why the magnitude of this s t e r i c strain would decrease if the dihedral angle was increased from 60 to 65 b. How would the magnitude of this s t e r i c strain between these two gauche methyl groups change (increase or decrease?) if the C 1 -C 2 -C 3 (or C 2 -C 3 -C 4 ) bond angle was increased to more than 109.5 ?
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This note was uploaded on 07/17/2011 for the course CHEM 237 taught by Professor Yu-chinli during the Spring '07 term at Texas A&M.

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