2012 Homework 5

2012 Homework 5 - cg- lo CHM 255- Homework #5 Due Thursday,...

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Unformatted text preview: cg- lo CHM 255- Homework #5 Due Thursday, February 23, 8 AM . What is the stereochemical relationship of the t—butyl and methyl groups in structure X? tBu IN 2. For this compound, which is more stable- conformer X or its flip chair conformer, Y? chair flip tBu H W..- 2‘. @ b.Y The energy difference between the conformers, X and Y, is (in kcal/mol): a. 5.0 .3. c. 1.74 . The difference in energy between the two conformers of cis-l ,3- dimethylcyclohexane is (in heal/moi): a. 1.74 b. 8 fl . Assume conformational interchange between the chair conformers of t- butylcyclohexane is similar to that seen on slide 38. Answer True or False: if a t—butyl group raises the energy of a conformer in which it is axial by 5 kcal/mol relative to the equatorial isomer, the rate of interconversion at room temperature (RT) between the axial and equatorial conformers is vanishingly small. 6. The index of hydrogen deficiency for a compound with the formula C9H13NB1‘20 is: a.1 13.2 @9 d4 7. True or False: trans-Cycloheptene is the smallest cycloalkene that can exist in a trans configuration at room temperature. a. C false ) 8. The name of the alkene drawn below is: CH3CH2 H ;c = < H CIHWCHg, CHZCH2CH3 a. trans-2-propyl-3-hexene b. cis-S-methyl-3—octene c. trans-4-methyl-5-octene ans-5 -rnethyl-3-octene ...
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2012 Homework 5 - cg- lo CHM 255- Homework #5 Due Thursday,...

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