Ch. 4 - Alkanes and CycloalkanesWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins

Solution: Sight down the C-2—C-3 bond, and draw Newman projection formulas for the (a) Most stable conformation of 2,2-dimethylbutane

Solution: Sight down the C-2—C-3 bond, and draw Newman projection formulas for the (a) Most stable conformation of 2,2-dimethylbutane

Problem

Sight down the C-2—C-3 bond, and draw Newman projection formulas for the 

(a) Most stable conformation of 2,2-dimethylbutane

Solution

We’re being asked to draw the Newman projection (viewing from C2-C3) for the most stable conformation of 2,2 dimethylbutane.


Recall conformational isomers are a class of isomers that differ in their single or σ bond rotation. Sigma bonds can freely rotate while pi bonds cannot.


The steps for drawing Newman projections are:

Step 1: Draw the bondline structure for the given molecule.

Step 2: Highlight draw an eye looking down the bond of interest.

Step 3: Draw the implied hydrogens along the bond of interest.

Step 4: Draw a front and back carbon with 3 groups each.


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