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Will rate: What would be the differences in the 1H NMR spectra between Trans-Stilbene and 1,2-dibromo-1,2-diphenylethane?...

Will rate: What would be the differences in the 1H NMR spectra between Trans-Stilbene and 1,2-dibromo-1,2-diphenylethane? And how do these differences useful in identifying trans-stilbene vs. 1,2-dibromo-1,2-diphenyl ethane?

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Answer #1

In case of 1,2-dibromo-1,2-diphenylethane, the protons of carbon atom attached with bromine will shift to high field by nearly 1 ppm in 1H NMR spectra when compared to Trans-Stilbene.

Rather the benzene proton near to bromine will shift to low field in case of 1,2-dibromo-1,2-diphenylethane when compared to Trans-Stilbene.

However only 1H NMR spectra is not just sufficient information to identifying trans-stilbene or 1,2-dibromo-1,2-diphenyl ethane. In addition to 1H NMR we need to analyse 13C NMR where the carbon atom attached with bromine in case of 1,2-dibromo-1,2-diphenylethane and carbon-carbon double bond in Trans-Stilbene will give significant information.

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