Chem241a_Lecture_37 - Organic Chemistry 241a Prof. Bogdan...

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Organic Chemistry 241a Prof. Bogdan Olenyuk Contact Information Office: Old Chemistry 309 olenyuk@email.arizona.edu Phone: (520) 626-0754 Course web site: http://www.chem.arizona.edu/courseweb/074/CHEM241A1_2/FrameSet.html
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Chapter 12: Organic Structure Determination • Determining the structure of an organic compound – Introduction to mass spectrometry of organic compounds – Magnetic-sector instruments – Interpreting mass spectra: fragmentation patterns – Mass spectrometry in biological chemistry: time-of-flight mass spectra • Spectroscopy and the electromagnetic spectrum – Absorption spectra – Infrared Spectroscopy – Interpreting infrared spectra – Infrared spectra of some common functional groups Today we will cover: Reading Assignment: McMurry (the BOOK), 12.1-12.8
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Chapter 12: Determining the Structure of an Organic Compound • The analysis of the outcome of a reaction requires that we know the full structure of the products as well as the reactants • In the 19 th and early 20 th centuries, structures were determined by synthesis and chemical degradation that related compounds to each other • Physical methods now permit structures to be determined directly. We will examine: – mass spectrometry (MS) – infrared (IR) spectroscopy – nuclear magnetic resonance spectroscopy (NMR) – ultraviolet-visible spectroscopy (VIS)
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Mass Spectrometry of Small Molecules: Magnetic-Sector Instruments • Measures molecular weight • Sample vaporized and subjected to bombardment by electrons that remove an electron – Creates a cation radical • Bonds in cation radicals begin to break (fragment) • Charge to mass ratio is measured
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• Plot mass of ions (m/z) (x-axis) versus the intensity of the signal (roughly corresponding to the number of ions) (y-axis) • Tallest peak is base peak (100%) – Other peaks listed as the % of that peak
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Chem241a_Lecture_37 - Organic Chemistry 241a Prof. Bogdan...

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