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310M-POW2_KEY - POW-2 Williams 31O/318M Due Date NOON Man...

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POW-2 Williams 31O/318M Due Date, NOON Man, 9/13/10 Name (print): _ Signature: _ Do Homework in PEN! Please write the first three letters of your last name in the boxes K ~ ~ ,
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POW-2 Williams 310/318M Due Date, NOON Man, 9/13/10 1. Consider the structure of bromopropane: H a) Draw the Newman projections for all the staggered conformations formed by rotation from 0 - 360 0 about the carbon-carbon single bond In blue. (1 pt) b) Circle the conformation(s) with 'lowest energy. Draw a square around the _--< ssr: ltQf rmation(s) with the highest energy. (2 pt) I -K \
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POW-2 Williams 310/318M Due Date, NOON Man, 9/13/10 2. Starting with the conformation of bromopropane depicted in #1, draw the energy diagram of bromopropane as a function of dihedral angle, accounting for all staggered and eclipsed conformations from 0-360° (1 pt). Include in the diagram the Newman projection for each 60° rotation (2 pt). The approximate values for torsional strain are given: Eclipsed H-H: 1.0 kcal/mol Eclipsed H-CH 3 : 1.2 kcal/mol Eclipsed CHTBr: 4.0 kcal/mol
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