Final - Fall 200605 - structures drawn below? ? a) b) c) d)...

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5 10 - 11. The following reagent list applies to questions 10-11 . a) NaNH 2 /NH 3 f) BH 3 ; H 2 O 2 / HO b) H 2 /Pd/C g) POCl 3 /pyr c) NBS/H 2 O/DMSO h) H 2 /Lindlar’s catalyst d) CH 3 OH/heat i) Li/NH 3 (liquid) e) Hg(OAc) 2 /H 2 O; NaBH 4 j) H 2 SO 4 /SO 3 What are the correct reagents necessary to carry out each transformation? 10 . (4 pts) Br Answer: a 11 . (4 pts) OH Br Answer: c Comments: These questions test for knowledge of reactions/reagents. There are examples of this type of questions in the practice set: TS4: 36, 71, 72, 73, PE4A: 30, PE4C: 8, 15-18). Question 10 is a simple elimination that requires strong base. Question 11 is a formation of bromohydrin. 12. (4 pts) Which symbol should be used to correctly represent the relationship between the two
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Unformatted text preview: structures drawn below? ? a) b) c) d) e) Comments: This question was about understanding resonance, and not confusing it with carbocation rearrangements. The structures differ only in position of electrons (which by definition is resonance). None of the atoms change position (which would be required in a carbocation rearrangement). There was no direct precedent for this question, but it tests a very basic concept. All questions on 1,2- vs. 1,4- electrophilic addition require understanding of that concept....
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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 Pennsylvania State University, University Park.

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