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H NMR

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Houman Khalili

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Jul 17, 2002, 6:38:47 PM7/17/02
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For H NMR of 1,4-diphenyl-1,3-butadiene, there are two pairs of
doublet, each pair with two conspicuous side-bands. Why is that? I
would have thought that the two middle and the two outside vinylic
protons give only doublets! I appreciate any suggestion.

Thanks alot

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