Midterm_2_F09_Key

The integrations are givin in parentheses next to the

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Unformatted text preview: her formation e. None of the above 1H NMR Spectroscopy 18. What is the internal standard used in 1H NMR spectroscopy? a. D2O b. Trichloromethylsilane c. Tetramethylsilane d. CCl4 e. None of the above Determine the number of non ­equivalent hydrogen nuclei in the following structure: O 19. a. b. c. d. e. 3 4 5 6 None of the above NH2 20. a. b. c. d. e. 4 5 6 7 None of the above Match the following structures to their 1H NMR Spectra: s=singlet, d=doublet, t=triplet, q=quartet, qt= quintet, sx=sextet, st=septet, ot=octet, m=multiplet (multiplet signals are overlapped and difficult to determine splitting). The integrations are givin in parentheses next to the splitting pattern. Match the following structures to their 1H NMR spectra: 21. q(1H), s(6H), d(3H) D 22. singlet. No integration because there is only 1 peak. Integration only compares peaks to each other. C 23. st(1H),s(3H),d(6H) A 24. 2H),t(3H) E d(2H),s(1H),s(1H),qt(1H),qt( C13 NMR Spectroscopy Determine the number of non ­equivalent carbon nuclei in the following structure: 25. t(2H),s(3H),t(2H),qt(2H),s(2H) B 26. a. b. c. d. e. 4 5 7 8 None of the above O O O 27. a. 2 b. 3 c. 4 d. 5 e. None of the above Match the following structures to their 13C NMR spectra: 28. 4 signals E 29. 4 signals B 30. 3 signals C 31. 4 signals A 32. 3 signals D Mass Spectrometry 33. A compound i...
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This note was uploaded on 08/14/2010 for the course BIO 2010 taught by Professor Le during the Summer '10 term at UCSB.

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