The following a arylation of a dihydrofuran and derivative was used in the synthesis of a natural product.

Pd$2($dba$)3(4\%$mol$)$ NaOAc,MeCN propose a possible catalytic cycle to account for the observed transformation. show The oxidation state of a Pd at each stage in the cycle. for each elementary step, indicate the type of process involved $($e$.$g$.$ transmetallation$)$