# Which has the higher chemical shift E/Z alkene?

If you have a simple alkene for example 1-methyl-But-2-ene

then you will have two methyl groups on one side of the double bond, which one of these will have the highest. Will the one on the same side as the rest of the chain of butene have the higher ppm or will it be the one in trans with the butene.

By the way, on my spectra, these two methyl groups are not equivalent. I need to know if the E or Z will have a higher chemical shift and why, thanks.

• “1-Methyl-but-2-ene” is not a valid name. Do you mean “pent-2-ene”? – Loong Jan 1 '16 at 19:53

cis-butene: $\delta$(H2): 5.37 ppm [1]
trans-butene: $\delta$(H2): 5.55 ppm [2]