This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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
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 = <
CHZCH2CH3 a. trans-2-propyl-3-hexene
c. trans-4-methyl-5-octene ans-5 -rnethyl-3-octene ...
View Full Document
- Spring '10