Organic Chemistry: Structure and Function
8th Edition
ISBN: 9781319079451
Author: K. Peter C. Vollhardt, Neil E. Schore
Publisher: W. H. Freeman
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Chapter 4.6, Problem 4.15E
Interpretation Introduction
Interpretation: The molecular models of cis- and trans- decalin is to be constructed and its conformational mobility needs to be explained.
Concept introduction: Decalin is the product formed when two hydrogen from ethyl groups are removed from 1,2-diethylcyclohexane. Cis and trans-form is based on the position of two hydrogen atoms.
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Write two chair conformations of the cis-1-ethyl-2-methylcyclohexane. Decide which one is stable and explain your answer.
Consider 1-bromopropane, CH3CH2CH2Br.
(a) Draw a Newman projection for the conformation in which CH3 and -Br are anti (dihedral angle 180°).
(b) Draw Newman projections for the conformations in which - CH3 and -Br are gauche (dihedral angles 60° and 300°).
(c) Which of these is the lowest energy conformation?
(d) Which of these conformations, if any, are related by reflection?
Consider 1-bromo-2-methylpropane and draw the following.
Q) The staggered conformation(s) of lowest energy
Chapter 4 Solutions
Organic Chemistry: Structure and Function
Ch. 4.1 - Prob. 4.1ECh. 4.1 - Prob. 4.3TIYCh. 4.2 - Prob. 4.4ECh. 4.2 - Prob. 4.6TIYCh. 4.3 - Prob. 4.7ECh. 4.4 - Prob. 4.8ECh. 4.4 - Prob. 4.10TIYCh. 4.4 - Prob. 4.11ECh. 4.4 - Prob. 4.12ECh. 4.4 - Prob. 4.14TIY
Ch. 4.6 - Prob. 4.15ECh. 4.7 - Prob. 4.16ECh. 4.7 - Prob. 4.17ECh. 4.7 - Prob. 4.18ECh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32PCh. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - Prob. 35PCh. 4 - Prob. 36PCh. 4 - Prob. 37PCh. 4 - Prob. 38PCh. 4 - Prob. 39PCh. 4 - Prob. 40PCh. 4 - Prob. 41PCh. 4 - Prob. 42PCh. 4 - Prob. 43PCh. 4 - Prob. 44PCh. 4 - Prob. 45PCh. 4 - Prob. 46PCh. 4 - Prob. 47PCh. 4 - Prob. 48PCh. 4 - Prob. 49PCh. 4 - Prob. 50PCh. 4 - Prob. 51PCh. 4 - Prob. 52PCh. 4 - Prob. 53PCh. 4 - Prob. 54PCh. 4 - Prob. 55PCh. 4 - Prob. 56PCh. 4 - Prob. 57PCh. 4 - Prob. 58PCh. 4 - Prob. 59PCh. 4 - Prob. 60P
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- Consider 1-bromopropane, CH3CH2CH2Br. (a) Which of these is the lowest energy conformation?arrow_forwardBetween the cis and trans configuration of 1-chloro-4-methylcyclohexane, which is the most stable stereoisomer and configuration? To prove your argument, draw a model or use a modeling software to model cis- and trans-1-chloro-4-methylcyclohexane (show all the hydrogens and ensure proper chair conformation) and use arrows to show where steric strain occurs.arrow_forwardDraw the alternative chair conformations for the cis and trans isomers of 1,2-dimethylcyclohexane, 1,3- dimethylcyclohexane, and 1,4-dimethylcyclohexane. (a ) Indicate by a label whether each methyl group is axial or equatorial. (b) For which isomer(s) are the alternative chair conformations of equal stability? (c) For which isomer(s) is one chair conformation more stable than the other?arrow_forward
- Consider 1-bromo-2-methylpropane and draw the following. Q) The staggered conformation(s) of highest energyarrow_forwardUsing what you know about the conformational energetics of substituted cyclohexanes, predict which of the two decalin isomers is more stable. Explain your reasoning.arrow_forwardDraw all three staggered conformations for the following compound, viewed along the C₂-C3 bond. Determine which conformation is the most stable, taking into account gauche interactions and hydrogen-bonding interactions. (J. Phys. Chem. A 2001, 105, 6991-6997) Provide a reason for your choice by identifying all of the interactions that led to your decision. H₂C OH C₂ HO CH3 Which of the following is the most stable staggered conformer? Me Me *** Conformer B Me- Me Conformer A Me Conformer C Me Conformer B because the anti OH groups avoid hydrogen bonding, which is a destabilizing effect. Conformer A because there are only two gauche interactions, and hydrogen bonding between the two OH groups is a stabilizing effect. Conformer C because there is no steric strain for Me-OH gauche interactions and hydrogen bonding between the two OH groups is a stabilizing effect. Conformer B because the large OH groups are anti to each other.arrow_forward
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- The anti-conformation is the most stable n-butane conformation. If you could take a snapshot of a mole of n-butane, would a sizeable number of the molecules be in the gauche-conformation? Why or why not?arrow_forwardDefine the relationship between the molecule pairs shown below. Choose from the following relationships: Different Molecules Constitutional Isomers Conformational Isomers Geometric Isomers Enantiomers Diastereomers Write the relationship in the space provided. Relationship (A) Identical Br: Conformational isomers AND (В) I dentical enantiomers :Br: AND он (C) OH он Constilulional isomers AND --arrow_forwardtrans-1,4-Di-tert-butylcyclohexane exists in a normal chair conformation. cis-1,4-Di-tertbutylcyclohexane, however, adopts a twist-boat conformation. Draw both isomers and explain why the cis isomer is more stable in a twist-boat conformation.arrow_forward
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