HW08MWF12p - used as a biomarker for the presence of marine...

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MWF 12:00 Section – Bocknack CH 310M/318M Fall 2008 UTEID: Please submit to the correct slot in the collection box outside WEL 2.212!!! Last Name: First Name: Score: Graded Homework Problem #08 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
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Unformatted text preview: used as a biomarker for the presence of marine algal matter in the environment. 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...
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