Concept explainers
Interpretation:
Conformational analysis of
Concept introduction:
Conformers are molecules that differ only by a rotation of one part of the molecule about a single bond.
Conformation analysis is nothing but the study of energy changes that occur during the rotation about the
A Newman projection of a molecule is the representation of its three dimensional structure looking along the bond of interest. The atom at the front end, typically a carbon atom, is represented by a point. The bonds to the three groups attached to it converge on this point. The carbon atom at the back is represented by a circle, with the three bonds to its attached groups ending on the circle.
Depending on the relative positions of the groups on the front and the back carbon, the conformations are classified into two main types.
Eclipsed conformation is one in which the dihedral angle is
Depending on the presence and interactions between bulky groups, the staggered conformation is further divided into anti and gauche conformers. In the anti-conformation, the dihedral angle between bulky groups is
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Chapter 4 Solutions
ORGANIC CHEMISTRY E-BOOK W/SMARTWORK5
- how many double bonds would C2H2Cl2F2 have?arrow_forwardDraw the structural isomers of C2H4BrCl and identify which of them has a chiral center. Then, create the Newman projection of the most stable conformational isomer and indicate its absolute configuration.arrow_forwardExamine the structure of PGF2a. Identify all chiral centers and all double bonds about which cis,trans isomerism is possible and state the number of stereoisomers possible for a molecule of this structure.arrow_forward
- Write a conformational structure for 1,2,3-trimethylcyclohexane in which all the methyl groups are axial and then show its more stable conformation.arrow_forward1. a. Draw and name the five cycloalkane structures of formula C5H10. Can any of these structures give rise to geometric (cis-trans) isomerism? If so, show the cis and trans stereoisomers. b. Draw and name the eight cycloalkane structures of formula C6H12 that do not show geometric isomerism. c. Draw and name the four cycloalkanes of formula C6H12 that do have cis-trans isomers. 2. Each of the following descriptions applies to more than one alkane. In each case, draw and name two structures that match the description. (a) an isopropylheptane (b) a diethyldecane (c) a cis-diethylcyclohexane (d) a trans-dihalocyclopentane (e) a (2,3-dimethylpentyl)cycloalkane (f) a bicyclononane 3. 2. refer to the photo attached and answer the ff.3-33, 3-34arrow_forwardDraw and name the four cycloalkanes of formula C6H12 that do have cis-trans isomers.arrow_forward
- A long polymer chain, such as polyethylene ( -CH2CH2- )n, can potentially exist in solution as a chiral object. Give two examples of chiral structures that a polyethylene chain could adopt.arrow_forward3. How many kinds of H are there in the isomers of dimethylcyclopropane?arrow_forward(a) Draw four compounds with molecular formula C6H12O, each containing at least one different functional group, (b) Predict which compound has the highest boiling point, and explain your reasoning.arrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning