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Elucidating the Metabolism of 2,4-Dibromophenol in Plants
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Distribution patterns suggest biomagnification of halogenated 1'-methyl-1,2'-bipyrroles (MBPs)

Kristin C Pangallo1, Christopher M Reddy

  • 1MIT/WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, Massachusetts 02543, USA. pangallo@whoi.edu

Environmental Science & Technology
|February 13, 2009
PubMed

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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