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    I have been asked to work out the coupling constants between the alkenic protons in styrene. (recorded using a 270MHz nmr spectrometer). When looking at the nmr spectra, i measured the intensities of the lines as 0.5mm and 2*1mm respectively. I have divided these 2 values by 270 to get 0.00038hz and 0.000185hz respectively. Am i correct?
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    To work out the coupling constants you need the chemical shift of the peaks then convert these to Hz. Then you need to determine the type of coupling and the J values they exhibt e.g. if you have a doublet with two peaks one at 677Hz and the other at 671Hz then J = 6 Hz

    J values are typically in the 1-15 Hz sort of region.
 
 
 
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