Question #9327a

1 Answer
Jul 20, 2015

You start with a wedge-dash structure.

Explanation:

Then you convert the wedge-dash structure to a Newman projection.

The wedge-dash structure for the staggered conformation is shown below.

Wedge-Dash
(from www.chem.ucalgary.ca)

You want to convert it to a Newman projection through the #"C2-C3"# bond.

So you must view the molecule along the #"C2-C3"# axis with your eye closest to the methyl group.

Eyeball Right
(from www.chem.ucalgary.ca)

The closest bonds make a "Y", so choose a template with the bonds making a "Y" on the front carbon.

Template

Place the groups onto your template.

  • The groups on #"C-2"# go on the front carbon; the groups on #"C-3"# in back.
  • The groups with "normal" bonds go on the vertical lines: #"H"# in front and back.
  • The groups with wedged bonds go on the left hand side: #"CH"_3# in front and #"H"# in back.
  • The groups with dashed bonds go on the left hand side: #"H"# in front and back.

And you have a Newman projection for propane.

Newman
(from www.chem.ucalgary.ca)