Hartley arylation

Olefins can be arylated or alkylated at room temperature in the presence of Pd(Il) salts and air or moisture to give yields varying from a few percent to near quantitative. Carbon-carbon bond formation usually takes place at the less alkyl-substituted carbon atom of the double bond (Heck, 1968, 1969). Pd(II) salts catalyze nucleophilic attack on olefins more readily than do Pt(II) salts and both cis and trans addition are observed (Hartley, 1969). 

---