310-5 - Organic Lecture Series CH 310 N LECTURE 5 Textbook...

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Organic Lecture Series 1 CH 310 N LECTURE 5 Textbook Assignment: Chapter 12 (IR) Homework (for credit): POW 1 posted (Due Jan 31) Today’s Topics: NMR-splitting-interpretation of spectra Notice & Announcements: Dr Baptiste today-2-3PM WEL 1.308
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Organic Lecture Series 2 Chemical Chemical Shifts Shifts 1 H-NMR NMR RC H 2 OR (C H 3 ) 4 Si ArC H 3 H 3 RC C H RCC H 3 RO H H 2 OH H 2 R O O H 2 R R 3 C H R 2 N H H 2 R R 2 C=CRC H R 2 R 2 C=C H R H O RCO H O H 2 Cl H 2 Br H 2 I H 2 F Ar H O O R 2 H 2 RCOC H 3 H 2 R ArO H 9.5-10.1 3.7-3.9 3.4-3.6 Typeof Hydrogen 0 (by definition) Hydrogen Chemical Shif t ( δ ) 1.6-2.6 2.0-3.0 0.8-1.0 1.2-1.4 1.4-1.7 2.1-2.3 0.5-6.0 2.2-2.6 3.4-4.0 δ ) 3.3-4.0 2.2-2.5 2.3-2.8 0.5-5.0 4.6-5.0 5.0-5.7 10-13 4.1-4.7 3.1-3.3 3.6-3.8 4.4-4.5 6.5-8.5 4.5-4.7
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Organic Lecture Series 3 Physical Basis for ( n + 1) Rule • Coupling of nuclear spins is mediated through intervening bonds – H atoms with more than three bonds between them generally do not exhibit noticeable coupling – for H atoms three bonds apart, the coupling is referred to as vicinal coupling
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Organic Lecture Series 4 b aa (n+1) rule for simple compounds n= 2; triplet; 6H n= 6; 7 peaks; 2H
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This note was uploaded on 04/24/2011 for the course CH 56255 taught by Professor Colapret during the Spring '11 term at University of Texas at Austin.

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310-5 - Organic Lecture Series CH 310 N LECTURE 5 Textbook...

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