The kinetics of Pd-catalyzed Tsuji-Trost allylation employing simple phosphine ligands (L = Ar3P, etc.) are consistent with turnover-limiting nucleopile attack of an electrophilic [L2Pd(allyl)](+) catalytic intermediate. Counter-intuitively, when L is made more electron donating, whcih renders [L2Pd(allyl)](+) less electrophilic (by up to an order of magnitude), higher rates of turnover are observed. In the presence of catalytic NaBArF, large rate differentials arise by attenuation of ion-pair return (via generation of [L2Pd(allyl)](+)//[BAr'F](-))a process that also increases the asymmetric induction from 28 to 78% ee in an archetypal assymmetric allylation employing BINAP (L*) as ligand. There is substantial potential for analogous application of (M)(n+) ([BAr'F](-))(n) cocatalysis in other transition metal catalyzed processes involving an ionic reactant or reagent and an ionogenic catalytic cycle.