FALL 2018 CEM 251: Organic Chemistry I Sections Oct 23 rd, 2018
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1 FALL 2018 CEM 251: Organic Chemistry I Sections TUE-TU 8:00 9:20 AM Oct 23 rd, 2018 Name: Section: PID: TA: This is a closed book and note examination. If boxes are provided for your answers, only what is written in the boxes will be graded. You have 80 min to complete the test. Section 25 Thu 10:20 11:10 AM Shuyao Section 26 Thu 10:20 11:10 AM Dan Section 27 Mon 12:40 1:30 PM Dan Section 28 Mon 9:10 10:00 AM Dan Section 29 Tue 10:20 11:10 AM Niloofar Section 30 Thu 1:50 2:40 PM Shuyao Section 31 Thu 4:10 5:00 PM Shuyao Section 32 Tue 3:00 3:50 PM Niloofar Section 33 Tue 4:10 5:00 PM Niloofar Section 34 Thu 4:10 5:00 PM Shuang Section 35 Thu 3:00 3:50 PM Shuang Section 36 Thu 1:50 2:40 PM Shuang Question Points Score Bonus 2 Total 100 (Max) 1
2 1. Provide a name or a structure for the following compounds (12 pts, 3 pts each box). a. (1R,3R) 1-bromo-3-propylcyclohexane b. I c. (3Z) 4-ethyl-3-methylhept-3-ene d. 2
3 2. Please determine the chirality (R/S) at the chiral center or stereochemistry (E/Z) at the double bond of the following compounds (12 pts, 3 pt/box) N O I O N 2 3. Please determine the relationship of the following pair of compounds (8 pts, 2 pt / box). Circle the Meso compound(s) (2 pts) Vs O 2 C N 2 Vs 2 C N 2 F F Vs O O C 2 N 2 N 2 C 2 Vs 2 N O O 2 N C 2 C 2 3
4 4. Please draw the reaction coordinate diagram of the following reaction based on the provided information. Please also indicate the reactant (R), transition state (TS), intermediate (I), product (P), ΔG and activation energy (Ea) in the reaction coordinate diagram. (16 pts, 2 pts per box) A + B C i) 2-step reaction ii) Endogonic reaction iii) 1st step is a rate determining step Energy Reaction Coordinate Please indicate whether the entropy of the following reaction is increase or decrease. (2 pts) 4
5 5. Please circle the faster reaction of the following pair of reactions (4 pts, 2 pts per question) A. F + Na + NaF Ethanol I + Na + NaI Ethanol B. + 2 O + DMSO + Li + DMSO Li 6 a) Please arrange the nucleophilicity of the following nucleophile from the most nucleophilic to the least nucleophilic (8 pts, 2 pts per box) F N 3 Br 2 O Most Nucleophilic 6 b) Please determine whether the indicated atom or bond is nucleophilic (Nuc) or electrophilic (Elc) (5 pts, 1 pts per box) N > > > Least Nucleophilic S Li 5
6 7. Please draw the reaction mechanism of the following reactions (16 pts, 2 pts per arrow). Indicate the reaction mechanism (SN1 or SN2) for each reaction (4 pts, 2 pts per box) A O SN1 or SN2? B. Li N 2 I + + LiI + N 3 SN1 or SN2? 6
7 8. Please fill in the starting material, reagent or product of the following reactions (16 pts, 2 pts per box). What kind of mixture was generated in Question 8B. (1pt) Please circle two minor products for Question 8C. (2pts total, 1 pts each) A. Br + O + NaBr O B. I + NaS Methanol + + NaI What kind of mixture has been synthesized from the above reaction (1 pts)? C. I + NaCN Ethanol + + NaI Please circle two minor products (2 pts total, 1 pt per answer) + D. + NaI DMSO + Na 7
8 Bonus question: Please explain what simple sentence (2 pts) Br in below picture did wrong in one Reference: 8
9 Scratch Sheet: Needs to be turned in with the test (if missing, the test will not be graded) 9
10 10
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