# How can I draw a perspective formula for ( R )-1,2-dibromobutane?

Jul 26, 2015

Here's the method I would use.

#### Explanation:

Step 1. Draw the butane chain.

Step 2. Add wedges and dashes to $\text{C-1}$ and $\text{C-2}$.

Step 3. Add the $\text{Br}$ to the solid bond and $\text{H}$ atoms to the other bonds of $\text{C-1}$.

Step 4. Arbitrarily add the second $\text{Br}$ to the wedge on $\text{C-2}$ and $\text{H}$ to the dash (I have a 50:50 chance of getting it right).

Step 5. Assign stereochemistry to $\text{C-2}$.

This is the $S$ structure. I got it wrong!

The correct structure must be