Organic Chemistry Semester 1 LABORATORY MANUAL - Moravian ...

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CH 3 Infrared Spectroscopy Appendix C8 Part V. Techniques and Theory IR Additional Out of Class Applications: 1. Predict approximate values of important IR ν's for the following compounds: O a. O O CH c. N 3 H b. CH 3 NH 2 d. CH 3 CH 2 C N 2. What functional groups are likely to be present in each of the following compounds? Explain your logic. (1.) C 4 H 6 O 3025, 2940, 2800, 2720, 1680 (st), 1630 cm -1 (2.) C 7 H 8 O 3300 (br & st), 3040, 2940, 1610, 1570, 1480, 1460, 1160 cm -1 (3.) C 9 H 10 O 3020, 2955, 1690 (st), 1600, 1590, 1460 cm -1 (4.) C 7 H 7 NO 2 3460, 3360, 3000 (br-st), 1670, 1640, 1180 cm -1 3. For the following pair of structures, if you had the IR spectrum of a reaction product that had to be one of the compounds, how could you use the spectrum to distinguish between the two possible structures? Explain how. vs. H O O 4. What functional groups might be present in the molecule that produced the following set of data? Give one or two possible structures that are consistent with the molecular formula and the spectrum. Explain your logic. C 5 H 8 O 4000 3600 3200 2800 2400 2000 FREQUENCY (CM -1 ) 1800 1600 1400 1200 1000 800 600 400 Transmittance (%) 80 60 40 20 0
Mass Spectrometry Appendix D1 Part V. Techniques and Theory Appendix D. Mass Spectrometry Mass Spectra Theory & Practice (See also: Padías pp. 98 - 105 & CGWW pp. 50-56) In Mass Spectral Analysis, organic molecules are bombarded by high energy electrons. Impact of an electron on a molecule transfers a large amount of energy to the molecule. M + * e - M * + e - One way that the molecule can dissipate the excess energy is to lose an electron and become a Radical Cation the "Molecular Ion". M * M + . + e - The mass spectrometer is designed to separate and count cations according to their charge/mass ratio (m/z). Since most ions have lost only one electron, m/z = mass of the ion. Examples of Mass Spectra of Pure compounds: 43 CH 3 CH CH 3 CH 2 CH 2 CH2 CH 3 71 85 M + 100 Let's try another compound !!!! What Happened? Intensity 27 29 31 41 43 55 70 CH 3 CH 3 O H CH CH 2 CH 2 M + 88 m/z Clearly, There are more ions than just that formed by the loss of an electron from the whole molecule!!! What could be happening?
Page 1 and 2: MORAVIAN COLLEGE CHEMISTRY DEPARTME
Page 3 and 4: 2 Introduction PART V: Appendix A T
Page 5 and 6: Fall 2008 4 Part I. Introduction As
Page 7 and 8: Fall 2008 6 Part I. Introduction As
Page 9 and 10: Fall 2008 8 Part I. Introduction We
Page 11 and 12: Fall 2008 10 Part I. Introduction n
Page 13 and 14: Fall 2008 12 Part I. Introduction r
Page 15 and 16: Fall 2008 14 Part II. Lab Rules and
Page 17 and 18: Fall 2008 16 Part III. Lab Record &
Page 25 and 26: Fall 2008 24 Part IV. Experiments P
Page 27 and 28: Extraction Appendix B1 Part V. Tech
Page 29 and 30: Infrared Spectroscopy Appendix C1 P
Page 35: Infrared Spectroscopy Appendix C7 P
Page 39 and 40: c Mass Spectrometry Appendix D3 Par
Page 41 and 42: Mass Spectrometry Appendix D5 Part
Page 43 and 44: Mass Spectrometry Appendix D7 Part
Page 45 and 46: Nuclear Magnetic Resonance Appendix
Page 65: Nuclear Magnetic Resonance Appendix

Organic Chemistry Semester 1 LABORATORY MANUAL - Moravian ...

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