1 H NMR Spectroscopy Advanced Topics. Fourier Transformation.

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Presentation transcript:

1 H NMR Spectroscopy Advanced Topics

Fourier Transformation

Ferromagnetic Impurity (above)

300 vs. 600 MHz

Induced Fields

Benzene Deshielding

Carbonyl Deshielding

Alkyne Shielding

cis or trans? Look at J value for vinyl doublets

 - and  -Glucopyranose

First-Order Doublets  /J > 8

Non First-Order Doublets  /J = 2

 coupling  J in Hz

Butanal

Styrene

Allyl Alcohol

Cumene

Methine H in Isopropyl Group a quartet of quartets

qq results in 7 lines

Triplet of triplets (J = 10; J = 5) Intensity Ratios are Different

dqd (J = 12; J = 7; J = 4)

Quartet at  25.0, 300 MHz each ppm is 75 Hz

 22.0 (q, J=150),  25.0 (q, J=150) (at 300 MHz)

At 600 MHz…