35. (4 pts) Which of the following statements about Aand Bis true? ABa) 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 Bby 180oto 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 onlythe following reagents available to accomplish the transformation given below: a) KMnO4/H+f) BH3; H2O2/ HO−b) H2/Pd/C g) NBS/DMSO/H2O c) OsO4; NaHSO3h)H2/Lindlar’s catalyst d) Li/NH3(liquid) i) HIO4e) Hg(OAc)2/H2O; NaBH4j)H2SO4/SO3 6. (4 pts) What reagent was employed to carry out the third (III) step? OIIIIIIHComments: 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.