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Nucleophilic attack of 3-hydroxycoumarin on η3-р-allylpalladium complex formed from substituted cinnamyl alcohols and acetates in the presence of palladium acetylacetonate and triphenylphosphine resulted normal addition product like 4-(3´-phenylallyl)-3-hydroxycoumarin, except for cinnamyl acetate, which provided an unusual product 4-(1´-phenylallyl)-3- hydroxycoumarin by conventional and microwave heating.

Unusual regioselectivity in nucleophilic addition to η3-p-allylpalladium complex in conventional heating and under microwave irradiation