lect_14 - LECTURE 14 SIMPLIFYING OR ELIMINATING COUPLING 7...

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Unformatted text preview: LECTURE 14 SIMPLIFYING OR ELIMINATING COUPLING 7 . 4 0 7 . 3 0 7 . 2 0 7 . 1 0 7.20 7.10 AA’XX’ SIMPLIFYING OR ELIMINATING COUPLING WHY? 1. OBTAIN A COUNT OF ACIDIC H’s 2. TO SIMPLIFY A COMPLEX SPECTRUM 3. TO CONFIRM J RELATIONSHIPS 4. MAKE SPECTRAL INTERPRETATIONS MORE CLEAR 5. VISUALIZE NON J-COUPLING MECHANISMS 1.OBTAIN A COUNT OF ACIDIC H’s 3.90 3.80 3.70 3.60 3.50 2.50 2.40 2.30 2.20 2.10 1.70 1.60 1.50 1.40 1.30 3.80 3.7 1.70 1.60 1.50 1.40 1.30 2.50 2.40 2.30 2.20 2.10 3.5 3.0 2.5 2.0 1.5 p145 p145 SPECTRAL SIMPLIFICATION BY DOUBLE RESONANCE dec. power = γ B /2 π for the ν 1 FOUR EXPERIMENTS 1. DP = O (no decoupling) 2. DP <<J nOe (no decoupling, intensity changes) 3. DP ≈ J (partial mult collapse) 4. DP = 2J (spin decoupling) SPECTRAL SIMPLIFICATION BY DOUBLE RESONANCE dec. power = γ B /2 π for the ν o FOUR EXPERIMENTS 1. DP > O (no decoupling) 2. DP <<J nOe (no decoupling, intensity changes) 3. DP ≈ J (partial mult collapse) 4. DP = 2J (spin decoupling) J R ∝ (J)( ν o- ν 1 ) J R = (J)( ∆ν )/dec. pow. OVERVIEW P 146 << SPECTRAL SIMPLIFICATION BY DOUBLE RESONANCE...
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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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lect_14 - LECTURE 14 SIMPLIFYING OR ELIMINATING COUPLING 7...

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