“…Taking advantage of the native reducing ability of alcohols, we have developed a family of redox-triggered carbonyl additions wherein hydrogen transfer from alcohols to p-unsaturated reactants produces electrophile-nucleophile pairs en route to products of formal alcohol CÀH functionalization via carbonyl addition. [5] Among the transformations emanating from this new pattern of reactivity, the enantioselective iridium-catalyzed alcohol C-allylation, which employs allyl acetate as the allyl donor, has proven particularly useful, availing exceptionally concise routes to diverse polyketide natural products. [6,7] Remarkably, the cyclometalated p-allyliridium C,Obenzoate catalysts used in such alcohol C-allylations display a pronounced kinetic preference for primary alcohol dehydrogenation, [8,9] enabling site-selective allylation of unprotected diols and triols with high levels of catalyst-directed diastereoselectivity.…”