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Antilla reported an enantioselective reduction of ketones using CPA 6h as the precatalyst. The use of catecholborane as the reducing agent in combination with 4‐dimethylaminopyridine (DMAP) gave secondary alcohols with 82–98% ee (Scheme 2.69). Based on the ¹¹B nuclear magnetic resonance (NMR) study, transition state 32 involving a boro‐phosphate intermediate was proposed [155].