Lecture 6 - CH 310 N T Th 2-3:30 LECTURE 6 Textbook...

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Unformatted text preview: CH 310 N T Th 2-3:30 LECTURE 6 Textbook Assignment: Chapter 13 finish Homework (for credit): POW 3 posted- Todays Topics: Origins of splitting; interpretation of unknowns Notice & Announcements: 2 nd Revision Conflict Exam List was emailed Kyle Williams Mon: 3-4 WEL 5.330 Lisa Alexander Mon: 10-11 Cubicle B Dan Propheter Tues: 8-9 Cubicle B Matt Sanderson Tues: 12-1 Cubicle A Organic Lecture Series 2 Origins of Signal Splitting Signal coupling: Signal coupling: an interaction in which the nuclear spins of adjacent atoms influence each other and lead to the splitting of NMR signals Coupling constant (J): Coupling constant (J): the separation on an NMR spectrum (in hertz) between adjacent peaks in a multiplet; a quantitative measure of the influence of the spin-spin coupling with adjacent nuclei Organic Lecture Series 3 because splitting patterns from spectra taken at 300 MHz and higher are often difficult to see, it is common to retrace certain signals in expanded form 1 H-NMR spectrum of 3-pentanone ; scale expansion shows the triplet quartet pattern more clearly Note: Integration is ~ 2:3 H 3 C CH 2 CH 2 CH 3 O Organic Lecture Series 4 Origins of Signal Splitting Organic Lecture Series 5 Origins of Signal Splitting This is the splitting of Proton H a Organic Lecture Series 6 Pascals Triangle as illustrated by the highlighted entries, each entry is the sum of the values immediately above it to the left and the right Not exam material Organic Lecture Series 7 Coupling of nuclear spins is mediated through intervening bonds H atoms with more than three bonds between them generally do not exhibit noticeable coupling...
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This note was uploaded on 12/08/2008 for the course BIO 365R taught by Professor Draper during the Fall '08 term at University of Texas at Austin.

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Lecture 6 - CH 310 N T Th 2-3:30 LECTURE 6 Textbook...

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