(a) What is the coupling constant between the alkene protons. (b) What does the

Question

(a) What is the coupling constant between the alkene protons.

(b) What does the coupling constant tell us about the geometry of the alkene (i.e. how do we

know that the alkene is trans-)? What value would you expect for the coupling constant if the

product were a cis-alkene?

What is the coupling constant between the alkene protons. What does the coupling constant tell us about the geometry of the alkene (i.e. how do we know that the alkene is trans-)? What value would you expect for the coupling constant if the product were a cis-alkene? H NMR spectrum of cinnamic acid (600 MHz, d6-acetone)*

Explanation / Answer

(a) What is the coupling constant between the alkene protons.

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