Sample Problem: a stereoisomer of 2-Iodobutane

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Using this tutorial...

Select one of the chiral carbons in the molecule by clicking on the the small 'x' button in the table shown below. Manipulate the molecule by dragging the mouse while depressing the button to move the lowest priority atom to the back, and assign R or S stereochemistry. When you have assigned all of the chiral centers in the molecule, and determined if the molecule is chiral or meso, you may check your answers by clicking on the "Show Answers" button. "Clear" will return the molecule to it's original presentation. The "Explain It!" button will offer an explanation of the assignments.

First, click on the button to select the chiral center.
Select Chiral Carbon: *

Next, click the mouse and drag across the molecule to rotate the lowest priority group (the hydrogen) to the back; assign R or S according to the standard RULES.

You may want to change the display or zoom on the molecule to make it easier to determine these priorities.

Display: Space Stick B/SWire

Zoom: On Off

Once you have assigned the stereochemistry, click on the Answers button to check your answer.

Answers: Show

If you need help identifying the atoms in the molecule, you can show atomic labels with this button; Clear returns the molecule to it's original presentation.

Labels: Show Clear All