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Quiz 1 - 2002 - Chemistry 439 Quiz I Name Student Number...

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Unformatted text preview: Chemistry 439 Quiz I March 26, 2002 Name Student Number This quiz consists of 25 points. Show all work to receive filll (or partial) credit. 1. I have just measured a vicinal lH-lH coupling constant at 300 MHz to be 7 Hz. What is the value of this coupling constant at 600 MHz (5 pts)? 2. Label the y and x axis of the following Karplus curve (this is for sp3 3 bond couplings) (6pts) m1 WORONS NICOLET 205x FT-fl 25 2.6 27 2.! 2.9 9 315 4 4.5 5 5.5 u z I! 9 10 I! 12 IS 14 15 I6 171819 2| 22” xfl fur, ’7 I; ' r it 3600 3400 1500 1500 14m mm 131) WAVENUMBERS 0.1 l mo:>-a<-lu=pa-¢* J.— I 02 as v.6 mnz>uaoou> 0.5 l - 0.5 w" M 0.: n 1. assesses gel 0 swe— 2.0 ‘50 320030002800290024002200 163.94 129.09'12339 I 182.02' 129.01‘ 1N'31 ' 131.55' 128.93' 116.74 131.09‘ 120.85‘ 61.74 ,‘ 1M.62'127.47 14.09‘ A. (3pts) The molecular formula is C6H7F302. The IR spectrum and the 1H NMR spectrum show a characteristic functional group. What is it? B. (3pts) The 13C spectrum is somewhat complicated by the presence of 19F (a spin 1/2 nucleus). Why does it complicate the 13C spectrum? C. (8 pts) The sp2 region of the 13C spectrum shows three types of quartets. The most downfield has splittings of 34.5 Hz (centered at 131.3 ppm), the next with 6 Hz (centered at 129.46 ppm), and the weakest with large 268.5 Hz splitting (centered at 122.1 ppm). ‘ Provide an organic structure that is consistent the data and assign these three peaks to your structure. ...
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