lec_9 - LECTURE 9 USING & INTERPRETING COUPLING CONSTANTS...

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LECTURE 9 USING & INTERPRETING COUPLING CONSTANTS PART II REMEMBER THE FOUR J CASES 1. N+1 RULE APPLIES 2. N+1 RULE • N+1 RULE 3. “NON-1 ST ORDER” 4. CHEM EQUIV / MAG NON-EQUIV”
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CONDITIONS FOR J-COUPLING A DETAILED TREATMENT: THE FOUR CASES 1. N+1 RULE APPLIES “FIRST ORDER” ∆ ν /J > 6 & “MAG EQUIV”
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CHCl 3 360 MHz CDCl 3 90 MHz P109 0.58 ppm J 13CH = 210 Hz 0.35 ppm J 13CD = 32 Hz
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TABLE 2.1 [P26] J FCN OF I I = ½ YES I = 1 SOMETIMES I > 1 RARE
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J values 1 J = “+” 2 J = “-” 3 J = “+”
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# E states = 2 n # peaks = 2n I + 1 I = ½ n + 1 P108
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3 9 3 ALLOWED TRANSITIONS I Z = ± 1 ONE SPIN = 1 TWO SPINS = 4 THREE SPINS = 15 (12 OBSERVED) COUPLING EXPLAINED – E level DIAGRAMS 2 2 P114 β α #E states = 2 n
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3 9 3 ALLOWED TRANSITIONS I Z = ± 1 ONE SPIN = 1 TWO SPINS = 4 THREE SPINS = 15 (12 OBSERVED) COUPLING EXPLAINED – E level DIAGRAMS 2 2 P114 β α #E states = 2 n
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9 3 ALLOWED TRANSITIONS I Z = ± 1
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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_9 - LECTURE 9 USING & INTERPRETING COUPLING CONSTANTS...

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