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212Lec6Sp09IR - Todays agenda 13C NMR(13.4-13.6 IR...

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Today’s agenda… 13 C NMR (13.4-13.6) IR Spectroscopy (12.6-12.8) Group Question #3 Last time… Splitting examples Integration 13 C NMR Hand in Lecture Problem 1 Lecture 6
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DEPT-NMR (Distortionless Enhancement by Polarization Transfer) are special types of 13 C NMR experiments. It distinguishes between CH, CH 2 , and CH 3 carbons. 13 C NMR Experiment Types of carbons revealed Normal 13 C C, CH, CH 2 , and CH 3 DEPT-45 CH, CH 2 , and CH 3 DEPT-135 CH 3 & CH are positive CH 2 is negative DEPT-90 CH only
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13 C NMR: broadband decoupled (normal) DEPT-90 DEPT-135 Each spectrum gives useful information about each unique carbon. Allows for annotation of spectrum. OH a b c d e f g h
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NMR Research… “Chemists Characterize Alzheimer’s Neurotoxin Structure” Amyloid plaques : according to experts, the cause of Alzheimer’s “We are developing tailor- made SSNMR methods to reveal its unknown tertiary structure, which may be significant for discovery of cures for the disease.” Dr. Yoshitaka Ishii at UIC Solid state NMR of intermediate thought to lead to formation of amyloid plaques
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