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Topic: YSU Organic Chemistry
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JRH  2573
10-22-2009 11:08 PM ET (US)
Dr. Norris, on the 2006 Exam 2, why is 10a not (E)-2-methylhex-2-ene but 7b is (E)-6-bromo-4-methylhept-3-ene?
Peter NorrisPerson was signed in when posted  2574
10-22-2009 11:11 PM ET (US)
JRH - if you have two of the same groups on one of the alkene carbons then you can't have E and Z isomerism - switch the methyl groups in 10a and you get the same compound.
Kaitlin  2575
10-22-2009 11:57 PM ET (US)
Dr.Norris on the 2008 exam question 7 part c how does it go from being 2,2,4,4 tetramethylpentane to a 2,4 dimethylpentane? where do the other methyl groups go?
Peter NorrisPerson was signed in when posted  2576
10-23-2009 12:00 AM ET (US)
Kaitlin - typo, they should be in there.
Aud  2577
10-23-2009 12:21 AM ET (US)
I'm glad you caught that too I was super confused! Good luck tomorrow everyone!
Anon.  2578
10-23-2009 04:24 PM ET (US)
Thank you, Dr. Norris, for emailing those flashcards. They were very helpful in studying for the exam.
jeff  2579
10-23-2009 05:55 PM ET (US)
That didn't do so well. Time to regroup !
Anyhow... when does the answer key go up ?
ANON  2580
10-23-2009 07:32 PM ET (US)
Dr. Norris, Don't forget to post the averages!! Thanks
Peter NorrisPerson was signed in when posted  2581
10-24-2009 12:37 AM ET (US)
Those summary slides seemed popular so I'll also do them for the upcoming mechanisms. Answer key is written will be posted on Monday afternoon; the average should be available sometime late tomorrow. Sunday is Liverpool-Manchester United so I want grading out of the way.
Peter NorrisPerson was signed in when posted  2582
10-25-2009 01:37 AM ET (US)
Grades are done and the exams will be handed back on Monday at the end of class.

High of 97, low of 17, average of 77/100 which is is very good.
ANON  2583
11-02-2009 03:23 PM ET (US)
Dr. Norris,
Will we be getting the mechanism flashcards again?
Peter NorrisPerson was signed in when posted  2584
11-02-2009 10:42 PM ET (US)
Anon - hopefully when I get an hour to do them. Addition of Br2 (with and without H2O), the ozonolysis, plus the epoxidation would probably be useful.
Jeff  2585
11-03-2009 04:17 PM ET (US)
If anyone would like some practice there here is a good site.
http://www.cem.msu.edu/~reusch/VirtualText/sterism3.htm
Kaitlin  2586
11-04-2009 08:01 PM ET (US)
Dr. Norris,
im having trouble trying to figure out why a weak acid was used to wash the crude tpentyl chloride in the lab. i believe i know why we didnt use NaOH but i cant figure out why we used sodium bicarbonate instead.
Peter NorrisPerson was signed in when posted  2587
11-04-2009 08:10 PM ET (US)
Kaitlin - you used a weak base (sodium bicarbonate) instead of a strong base (sodium hydroxide) to avoid a base-promoted E2 reaction.
Kaitlin  2588
11-04-2009 08:12 PM ET (US)
oh wow, i was definately thinking into that too far, thank you Dr. Norris!
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