# Meaning of the term "Activation of alkene"

While reading organic texts, I have come across authors referring to "Activation of alkene" what does that mean !? Does it mean to include the alkene in resonance or what else exactly ?

The palladium-catalyzed C-C coupling between aryl halides or vinyl halides and activated alkenes in the presence of a base is referred as the "Heck Reaction"

Activation of an alkene just means that the double bond has a higher electron density than that of a normal isolated double bond. That is, the electron density in the double bond is greater than the one observed in ethene $$\ce{CH2=CH2}$$.
Activation, in organic chemistry, generally means the compound displays a greater nucleophilic nature than it normally should due to increased electron density. For example, $$\ce{-OCH3}$$ group activates benzene when it forms toluidine. This makes the benzene ring more electron rich and so make it easier to react in nucleophilic reactions.
• The term was used to refer to an $\alpha, \beta$ unsaturated carbonyl in my notes for the Michael reaction. Doesn't that mean it's an electron deficient bond? Apr 30 at 9:00