Chem 3590 prelim 2 09 answers - P leasea lso w rite y our n...

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Please also write your name on the back of the last page. Page 1 of 7 NAME Last First Middle >>cHEMISTRY 3590 << >> PRELIM #2 << Tuesday, October 27th, 2009 7:30 - 9:00 PM Please do not open this exam until you are told to do so. There are 7 pages to this examination, including the cover. Check to make sure you have them all. You may use the backs of pages for scratch work, but all answers must appear in the designated space for credit. 1. t20 2. t16 3. 114 4. t15 5. t20 6. t15 (qu/66-e'.l6prnTire
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Page 2 of 7 1. (20 points) (a) Draw the structure of (E)-1 ,2-dich lo ro- 1 -hepten-5-vne in the box below. -Y*\\cg (b) In the box at right, draw the (S)-enantiomer of compound A below. Be sure to indicate the configuration clearly using wedges and dashed lines. CH20H I no-Acn=cn" CH2CI A (c) How many stereogenic atoms are present in the molecule B? LJ uH3u- | - lt-pn (d) What is the maximum number of stereoisomers that may theoreticallv exist for a molecule having the number of stereocenters present in B? q a' (e) For compound B, how many different stereoisomers actually exist? I r tr (4,r1 G" I N,rl atts \t/ , t/:; ([r) ) '(tt ( (: ttt (,,,i) (1,1) r\ LJ v,,3
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2. (16 points) (a) Rank the following carbocations in order of stability
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Chem 3590 prelim 2 09 answers - P leasea lso w rite y our n...

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