Question

Question: Draw Newman projections along the C3-C4bond to show the most stable and least stable conformations of 3 ethyl-2,4demethylheptane.

Short answer

Answer

Step-by-step solution

Newman projection

Newman projections are often used in drawing conformations. In Newman’s projection, one views the C-C bond end on along the axis of connection. The front carbon is represented by the intersection of bonds, while the rear carbon appears as a circle.

Using Newman projections to draw the most stable conformer

The two bulky groups (propyl and isopropyl) are anti-periplanar in most stable conformations, while in the least stable, the two bulky groups (propyl and isopropyl) are syn-periplanar.