04_lec_handout - Massachusetts Institute of Technology 4...

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Massachusetts Institute of Technology Organic Chemistry 5.13 September 13, 2006 Prof. Timothy F. Jamison Notes for Lecture #4 Organic Structure Determination: Infrared Spectroscopy (IR) and MS Fragmentation Patterns Molecules of the Day Isoamyl acetate – banana Benzaldehyde – almonds (R)– Limonene – lemon, lime 1,4-Diaminobutane – a.k.a. putrescine Imagine that four unlabelled vials, each containing one of our four "Molecules of the Day", had somehow become mixed up. How could IR spectroscopy (instead of your sense of smell) be employed to identify the contents of each vial? Three-Stage Strategy for Organic Structure Determination Determine the molecular formula using elemental analysis and mass spectrometry . • Identify the functional groups using infrared spectroscopy (IR) and nuclear magnetic resonance spectroscopy (NMR). • Elucidate the connectivity using 1 H NMR (“proton NMR”) and 13 C NMR (“carbon NMR”) spectroscopy. O
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04_lec_handout - Massachusetts Institute of Technology 4...

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