c)Conformational isomer is the different spatial arrangement of the atom that resulted from rotation about a single bond. (i) Differentiate anti conformers and gauche conformers (ii) Using a newman projection, draw the anti conformer and gauche conformers of 3,3-dimethylheptane (viewed along the C3-C4 bond) (t)

c)Conformational isomer is the different spatial arrangement of the atom that resulted from rotation about a single bond. (i) Differentiate anti conformers and gauche conformers (ii) Using a newman projection, draw the anti conformer and gauche conformers of 3,3-dimethylheptane (viewed along the C3-C4 bond) (t)

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter26: Lipids

Section: Chapter Questions

Problem 26.24P: Following is a structural formula for cortisol (hydrocortisone). Draw a stereo-representation of...

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Following is a planar hexagon representation for one isomer of 1,2,4-trimethylcyclohexane. Draw the alternative chair conformations of this compound and state which of the two is more stable.
Following is a structural formula for cortisol (hydrocortisone). Draw a stereo-representation of this molecule showing the conformations of the five- and six-membered rings.
Draw the conformational isomers of 1-bromo-2-chloroethane by rotating C-C single bond with dihedral angel 60°. AndWhy conformational isomers generally can not be separated from one another at room temperature?
(a) Draw the most stable chair conformers of trans-1,3-diisopropylcyclohexane and trans-1,4-diisopropylcyclohexane. (b) Which is more stable: trans-1,3-diisopropylcyclohexane or trans-1,4-diisopropylcyclohexane?
draw the most stable conformation of (a) ethylcyclohexane (b) 3-isopropyl-1,1-dimethylcyclohexane
For 1,2-dichloroethane: (a) Draw Newman projections for all eclipsed conformations formed by rotation from 0 to 360° about the carbon-carbon single bond. (b) Which eclipsed conformation(s) has the lowest energy? Which has the highest energy? (c) Which, if any, of these eclipsed conformations are related by reflection?
3)) Draw the most stable chair conformation of a 1,2,4-trimethylcyclohexane (Show all the hydrogens and indicate if the bond is axial or equatorial at the substitution).
There are four cis,trans isomers of 2-isopropyl-5-methylcyclohexanol:(a) Using a planar hexagon representation for the cyclohexane ring, draw structural formulas for the four cis,trans isomers.(b) Draw the more stable chair conformation for each of your answers in part (a).(c) Of the four cis,trans isomers, which is most stable? (Hint: If you answered thispart correctly, you picked the isomer found in nature and given the name menthol.)
Perspective drawings of Chair and Boat Conformers fo Cyclohexane (C6H12). Note it is impossible to place all the carbons in the same plane without straining the bonds. Take two opposite carbons and pull both of them up to make one conformation adn then pull one of them down to make the other conformation. Can you inercovert one conformer int othe other without breaking any bonds? Explain why these represent conformers and not isomers.
Among the figure, (a) what is the most stable conformation of n-pentane? (b) gauche conformation of butane and (c) least stable conformation of butane
Sight along the C2-C1 bond of 2-methylpropane (isobutane).(a) Draw a Newman projection of the most stable conformation.(b) Draw a Newman projection of the least stable conformation.(c) Make a graph of energy versus angle of rotation around the C2-C1 bond.(d) Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 4.0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.
4. (a) Draw a skeletal (line-bond) structure for 3,4-dimethylhexane. (b) Draw a sawhorse representation of any staggered conformation of this molecule looking down the carbon-3 to carbon-4 bond. (c) Draw a Newman projection looking down the carbon-3 to carbon-4 bond of the same conformation that you drew as a sawhorse representation.