Organic Chemistry
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Use the appropriate Newman projection for 2-methylbutane about the C2-C3 bond to write the most stable conformer for 2-methylbutane.
Use an appropriate Newman projection for (R)-3-methylhexane along the C3-C4 bond to draw the most stable conformer.
Write the appropriate Newman projection that corresponds to the following molecule, viewed from the direction of the arrow.
Provide the Newman projection that would be obtained by looking down the indicated bond in the given direction for the provided structure. Imagine yourself positioned as the eyeball, looking at the bond.
Based on the provided Newman projection, depict the molecule in its line-angle drawing while including all hydrogens and substituents. Ensure that the use of wedges and dashes indicates whether a substituent is projecting out of or receding into the plane of the page. In this structure, note that carbon b is positioned behind carbon a.
Based on the given Newman projection, draw the molecule in its skeletal structure while including all hydrogens and substituents. Ensure that the use of wedges and dashes indicates whether a substituent is projecting out of or receding into the plane of the page. In this structure, note that carbon b is positioned behind carbon a.
Complete the Newman projection based on the initial Newman projection provided and the direction and degree of rotation specified.
Draw the complete Newman projection based on the initial Newman projection provided and the direction and degree of rotation specified.
Complete the resulting Newman projection using the initial Newman projection and the indicated angle and direction of rotation.
Draw the resultant Newman projection based on the initial Newman projection provided and the indicated rotation.
Provide the Newman projection that would be observed by looking down the specified bond in the indicated direction, considering the given structures. Imagine yourself as the viewer, positioned as if you were the eyeball looking down the bond.
Draw the Newman projection that would be observed by looking down the specified bond in the indicated direction, considering the given structures. Imagine yourself as the viewer, positioned as if you were the eyeball looking down the bond.
Two conformers can be drawn for the trans isomer of 1,2-dimethylcyclohexane.(i) Draw Newman projections of the two conformers.(ii) Which conformer is present in greatest concentration at equilibrium?
(i) Draw the Newman projection of the most stable conformer obtained by rotation about the C3−C4 bond of 2,5-dimethylhexane.(ii) Draw the Newman projection of the least stable conformer obtained by rotation about the C3−C4 bond of 2,5-dimethylhexane.
For rotation about the C3−C4 bond of hexane through 360º, draw an appropriate potential-energy diagram. You should start the diagram with the least stable conformer.
Convert each of the following Newman projections to the corresponding line-angle formula. Determine the appropriate IUPAC name for each formula.
Draw the Newman projection for the chair form of cis-1,3-dimethylcyclohexane around the bond between carbon 1 and carbon 6. Keeping both methyl groups in equatorial positions, show that these methyl groups are anti to carbon 5.
Using Newman projections, show the most stable and least stable conformations of (3 S,4S,5S)-4-ethyl-3,5-dimethyloctane. The molecule should be viewed along the C3—C4 bond.
Provide the Newman projection observed if viewed down from C1 - C2 bond as shown below.
Complete the Newman projection that would result from looking down the indicated bond as shown below. [Orient yourself from the position of the eye.]
Which Newman projection skeleton below should you draw first to show what is seen when looking down the indicated bond of the line-angle drawing?
Looking down at the indicated bond, draw the three most stable conformations and choose the one that is most stable.
Looking down at the indicated bond, provide the three most stable conformations and choose the one that is most stable.
There are two possible conformers for cis-1,3-difluorocyclohexane.
(i) Using Newman projections, draw each conformer.
(ii) Identify the conformer that will predominantly exist at equilibrium.
Consider the following Newman projections:
What is their skeletal structure and IUPAC name?
Provide the Newman projection for the molecule given below. Project on the 3,4-bond and ensure that the dihedral angle between the chlorine and hydrogen atoms is 180°.
The gauche conformation of ethane-1,2-diamine (H2N-CH2CH2-NH2) is more stable than its anti-conformation. Draw the Newman projections of these conformers and explain why the gauche conformation is more stable.
Draw the conformer that predominates at equilibrium for the compound given below.1,2-dibromoethane
Draw out the most stable conformer for 2-methylpropane using a Newman projection. Observe the compound along the C2–C3 bond.
