University:
University of Pennsylvania
Course:
CHEM 2410 | Principles of Organic Chemistry I
Academic year:

2019
Views:

391

Pages:

1
Author:

rezancuk2j

OH Ortho: ~6-9 Hz Meta: ~2-3 Hz Para: ~0-1 Hz (or pk. broadening) Y 2495.45 J=8.85 Hz EXPECTED PEAK: doublet a X •split by b (J ~2, characteristic meta) EXPECTED PEAK: doublet EXPECTED PEAK: doublet of doublets J=2.20 Hz 2214.59 2212.55 •split by a (J ~9 Hz, characteristic ortho) •split by c (J ~2, characteristic meta) J=9.14 Hz J=2.04 Hz 2223.73 2221.43 b c 2259.64 for: Characteristic J constants Z 2257.44 In aliphatic organic compounds, the only coupling that you need to worry about is from adjacent protons (J =0 between any non-adjacent protons)... In aromatic compounds, however, significant splitting does not only come from ortho protons coupled to each other, but also from meta (even para) protons due to conjugated π bonds. Thus, coupling constants are a helpful tool for deciphering complicated aromatic regions, and are especially vital when the chemical shifts (δ ) between aromatic protons are uncertain or overlapping. 2486.60 •split by b (J ~9 Hz, characteristic ortho) NMR AROMATIC PROTON COUPLING

Nmr Aromatic Proton Coupling

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