Final - Fall 200603

Final - Fall 200603 - 5(4 pts Which of the following...

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3 5. (4 pts) Which of the following statements about A and B is true? AB a) They are different conformations of the same molecule. b) They are constitutional isomers. c) They are diastereomers. d) They are enantiomers. e) They are identical. Comments: The question was designed to test your understanding of stereochemical representations. It cannot get any simpler: just rotate B by 180 o to see it. There was no direct precedent for this question, but it tests a very basic concept, and there were questions about interpretation of stereochemical drawings on previous exams. 6-7 . A Chem-38 student had only the following reagents available to accomplish the transformation given below: a) KMnO 4 /H + f) BH 3 ; H 2 O 2 / HO b) H 2 /Pd/C g) NBS/DMSO/H 2 O c) OsO 4 ; NaHSO 3 h ) H 2 /Lindlar’s catalyst d) Li/NH 3 (liquid) i) HIO 4 e) Hg(OAc) 2 /H 2 O; NaBH 4 j ) H 2 SO 4 /SO 3 6. (4 pts) What reagent was employed to carry out the third ( III ) step? O I II III H Comments: This is a typical example of simple multi-step synthesis. A standard carbon count should lead one to the conclusion that one carbon has to be removed. From all the reagents listed only two could
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This note was uploaded on 01/12/2010 for the course PSYCH 100 taught by Professor Matchock,robert during the Fall '07 term at Penn State.

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