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Lecture5 - CHEMISTRY
30B
 ORGANIC
CHEMISTRY
...

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CHEMISTRY 30B ORGANIC CHEMISTRY Lecture 5
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No#ces and ques#ons….
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“Where in the world is Professor Garcia‐Garibay?”
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LAST MONDAY TUESDAY A Week ago FRIDAY, and flew out at 2am today WEDNESDAY and FRIDAY THURSDAY
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MORE NMR
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SO FAR WHAT NUCLEAR SPIN IS, HOW A NMR MACHINE DETECTS RESONANCES SAMPLE AND THE EXPERIMENT BASIC FEATURES OF PROTON SPECTRA Chemical ShiF ( δ , ppm) upfield and downfield integra#on of peaks equivalent protons
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Chemical shiFs of protons in various environments
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10 9 8 7 6 5 4 3 2 1 0 (ppm) CHEM 30C, COMMON 1 H NMR CHEMICAL SHIFT RANGES O H trans : 14-18 Hz cis : 8-10 Hz gem : 1-3 Hz aryl =C H alkene =C H O -C H - O , O -C H - X X -C H - X , Ar-C H - O , etc O -C H amide CO-N H and Ar-O
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