sample_exam_sample_exam_241a

sample_exam_sample_exam_241a - (the 3 rd step of your...

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CHEM 241 SAMPLE EXAM Answers will be posted Monday in the class bulletin board (across from Bagley 260) 1. For compounds A-F answer the following: NH 2 CH 3 C O CH 3 CO 2 H OCH 3 CH 3 OH CO 2 CH 2 CH 3 CH 3 CH 2 CHO C O CH 3 F mp 102 bp 77 o C mp 150 o C bp 185 o C mp 87 o C bp 125 o C E D C B A a) Besides chromatography, which method of purification would you use to separate and equal mixture of B and D. b) Besides chromatography, which method of purification would you use to separate E and C c) Besides chromatography, which method of purification would you use to separate a mixture with a composition of 90% B and 10% F. d) Draw a TLC plate of a mixture of A D and F developed in 50/50 hexane acetone. 2. Write the complete mechanism for step #2 of your 3 step synthesis. 3. Draw the mechanism for the reaction of “benzyne” with tetraphenylcyclopentadienone
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Unformatted text preview: (the 3 rd step of your synthesis) 4. In the Friedel Crafts reaction, show the product you would get if your substituted benzoyl chloride instead of acetyl chloride (an aromotic ring replaces the methyl group of acetyl chloride) 5. You have just synthesized target molecule A. Compounds B, C and D are the side product of the reaction. Using a flow chart, describe how would you purify A from this mixture. C CH 2 CH 3 H HO CO 2 H CHO HOMgBr (HO-, Mg ++ , Br-) D mp>350 C bp=125 B mp=120 A bp=165 C 6. (3 pts) Your synthesis of benzoic acid using the Grignard reaction failed. Later you found out that the ether you were using was contaminated with ethyl alcohol. Explain what had happened....
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This test prep was uploaded on 04/15/2008 for the course CHEM 241 taught by Professor Unsure during the Winter '06 term at University of Washington.

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sample_exam_sample_exam_241a - (the 3 rd step of your...

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