Chem 336 - Spring 1999 - Organic Chemistry III
Portland State University - Dr. Carl C. Wamser

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Chapter 25 Quiz Answers

1. (4 points) For the steroid shown below, relocate all the substituents onto the chair form and identify all the substituents as either equatorial (circle) or axial (square).

2. (4 points) Frying fats often have an acrid odor attributable to acrolein, shown below. Draw a generic structure for a triglyceride (acyl group = RCO- ) and show what steps (not mechanisms) would have to occur to generate acrolein. Frying conditions involve heat and a limited amount of water.

There is one hydrolysis and two eliminations. One sequence could be:

3. (2 points) Write a complete structure for a phospholipid. It can be any one, but it should be a specific compound, not a generic structure.

Lots of possibilities, such as