318-7 - CH 318 N LECTURE 7 Textbook Assignment: Chapter 14...

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1 CH 318 N LECTURE 7 Textbook Assignment: Chapter 14 (Begin 15) Homework (for credit): POW 4 posted Today’s Topics: Mass Spec-Interpretation Notice & Announcements: Spectra Workshop this Thursday Organic Lecture Series 2 Fragmentation of M • To attain high efficiency of molecular ion formation and give reproducible mass spectra, it is common to use electrons with energies of approximately 70 eV [6750 kJ (1600 kcal)/mol] – this energy is sufficient not only to dislodge one or more electrons from a molecule, but also to cause extensive fragmentation – these fragments may be unstable as well and, in turn, break apart to even smaller fragments
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2 Organic Lecture Series 3 Fragmentation of M • Fragmentation of a molecular ion, M, produces a radical and a cation only the cation is detected by MS A-B A A B B + Molecular ion (a radical cation) + + + + Cation Radical Radical Cation Organic Lecture Series 4 Fragmentation of M • A great deal of the chemistry of ion fragmentation can be understood in terms of the formation and relative stabilities of carbocations in solution – where fragmentation occurs to form new cations, the mode that gives the most stable cation is favored
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This note was uploaded on 04/20/2009 for the course CH 318N taught by Professor Willson during the Spring '08 term at University of Texas at Austin.

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318-7 - CH 318 N LECTURE 7 Textbook Assignment: Chapter 14...

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