NMR Chapter 13 1 H-NMR Spectroscopy CHEMISTRY 220 Spring 2003.

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Presentation transcript:

NMR Chapter 13 1 H-NMR Spectroscopy CHEMISTRY 220 Spring 2003

MEK (2-butanone) a b c Signal b expanded Signal c expanded Integration: ____mm #protons a - 58  3 b - 40  2 c - 59  3 Splitting: ____Multiplet “sees” a - singlet  0 H’s b - quartet  3 H’s c - triplet  2 H’s

Coupling Trees for MEK

Butanal Integration: ____mm #protons a - 33  1 b - 65  2 c - 98  3 Splitting: ____Multiplet “sees” a - singlet  0 H’s b - d of q  3 H’s c - triplet  2 H’s a b c Signal b expanded Signal c expanded

Coupling Trees for Butanal

1,3-Dibromopropane 4 2 a b a Plane of symmetry b b (quintet) a (triplet) identical

Isopropyl butanoate a b c d e Integral a – 3p b – 6p c – 2p d – 2p e – 1p a b c e d e (septet) d (t) c (sextet) b (d) a (t)

p-Methylbenzoic acid Effect of an electron withdrawing group a b c d Deshielded by resonance

1-Methoxy-4-methylbenzene Effect of an electron donating group a b cd Shielded by resonance

Deuterated Solvents Deuterium ( 2 H) has a spin quantum No. of 1. Deuterium does not couple to protons ( 1 H). Different deuterated solvents can affect chemical shifts.