The reaction of cyclohexene with iodobenzene under Heck...

The reaction of cyclohexene with iodobenzene under Heck conditions forms $\textbf{E}$, a coupling product with the new phenyl group on the allylic carbon, but none of the "expected" coupling product $\textbf{F}$ with the phenyl group bonded directly to the carbon-carbon double bond. a. Draw a stepwise mechanism that illustrates how $\textbf{E}$ is formed. b. Step [2] in Mechanism 26.2 proceeds with syn addition of Pd and R' to the double bond. What does the formation of $\textbf{E}$ suggest about the stereochemistry of the elimination reaction depicted in Step [3] of Mechanism 26.2?

The reaction of cyclohexene with iodobenzene under Heck conditions forms $\textbf{E}$, a coupling product with the new phenyl group on the allylic carbon, but none of the "expected" coupling product $\textbf{F}$ with the phenyl group bonded directly to the carbon-carbon double bond.

a. Draw a stepwise mechanism that illustrates how $\textbf{E}$ is formed.
b. Step [2] in Mechanism 26.2 proceeds with syn addition of Pd and R' to the double bond. What does the formation of $\textbf{E}$ suggest about the stereochemistry of the elimination reaction depicted in Step [3] of Mechanism 26.2?