Provide the starting materials required to produce the given compound using a Heck reaction.

Heck reaction showing starting materials with variable X as Cl, Br, or I.

Heck reaction with starting materials and variable X as Cl, Br, or I.

Heck reaction diagram with starting materials and variable X as Cl, Br, or I.

Heck reaction illustration with starting materials and variable X as Cl, Br, or I.