HW #8 Key - Look at this line-angle structure of...

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Bocknack CH 310M/318M Fall 2008 Graded Homework Problem #08 – Answer Key Deadline : 3:00 p.m., Monday, 10/6/08 LATE WORK WILL NOT BE ACCEPTED OR GRADED!!! This problem is worth a total of 20 raw points. Each box is worth 4 points. The molecule shown below is brassicasterol, which is a naturally occurring steroid that is found in phytoplankton and certain terrestrial plants. Since this molecule is stable for centuries in anaerobic soils and sediments, it is often used as a biomarker for the presence of marine algal matter in the environment.
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Unformatted text preview: Look at this line-angle structure of brassicasterol, and determine the total number of chiral centers present in this molecule. Write your answer in the appropriate box. Several (but not all) of these chiral centers are marked with arrows. In the box associated with each arrow, indicate the stereochemical configuration of the chiral center as ( R ) or ( S ) . Total number of chiral centers present = H H H O H H Brassicasterol ( S ) ( S ) ( S ) ( R ) 9 2 3 1 4 1 3 2 4 1 2 3 4 1 2 3 4 * * * * * * * * *...
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This note was uploaded on 02/07/2009 for the course CH 310M taught by Professor Iverson during the Fall '05 term at University of Texas at Austin.

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