lec_6 - LEC SIX THE CHEMICAL SHIFT PART II PROTON &...

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LEC SIX THE CHEMICAL SHIFT PART II PROTON & CARBON CHEMICAL SHIFT & SHIELDING MECHANISMS σ diam σ non-loc = σ neigh atom + σ ring curr + σ elec field + σ solvent σ para
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USING CHEMICAL SHIFTS PROTON 5.6 7.1 CABON 130 127
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http://www.chem.wisc.edu/areas/reich/handouts/nmr-h/hdata.htm
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http://www.chem.wisc.edu/areas/reich/handouts/nmr-h/hdata.htm
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http://www.chem.wisc.edu/areas/reich/handouts/nmr-h/hdata.htm
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http://www.chem.wisc.edu/areas/reich/handouts/nmr-h/hdata.htm
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CASES WHERE σ non-loc OPERATE 1 H SHIFTS C 2 H 6 0.86 C 2 H 4 5.27 C 6 H 6 7.27 (see Bruice O-Chem 3 rd Ed.)
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T = THUMB T FINGERS
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CASES WHERE σ non-loc OPERATE 1 H SHIFTS C 2 H 6 0.86 C 2 H 4 5.27 C 6 H 6 7.27 C 2 H 2 2.35 (see Brown & Foote O-Chem 3 rd Ed.) π -e- circ. π -e- circ. B i B i
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TWO ORIENTATIONS
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SHIELDING MECHANISMS FOR 13 C σ paramag dominates & χ (electroneg important) TMM 27 δ χ = 2.5 TMS 0 δ χ = 1.9
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P59 DATA TO ISOLATE DIRECT ELECTRONEGATIVITY
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P69
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This note was uploaded on 08/06/2008 for the course CHEM 124 taught by Professor Amagata during the Winter '08 term at UCSB.

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lec_6 - LEC SIX THE CHEMICAL SHIFT PART II PROTON &...

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