318-5 - CH 318 N LECTURE 5 Textbook Assignment: Chapter 13...

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1 CH 318 N LECTURE 5 Textbook Assignment: Chapter 13 (Cont’d) Homework (for credit): POW 3 posted Today’s Topics: NMR: Equivalent protons; integration; splitting 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
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2 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
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318-5 - CH 318 N LECTURE 5 Textbook Assignment: Chapter 13...

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