Phosphoryl catechol borate

Enantioselective reduction of ketones has been carried out using catecholborane and a BINOL-derived phosphoric acid the latter is suggested to be a pre-catalyst, with B-NMR evidence for the formation of a phosphoryl catechol borate as active catalyst. ... 

The mechanistic studies of a chiral Brpnsted acid-catalysed asymmetric reduction of ketones with catecholborane as the reducing agent to give highly enantioselective chiral secondary alcohols indicated that phosphoryl catechol borate, derived from reaction of the Brpnsted acid with catecholborane, acts as the active catalyst. ... 

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See also in sourсe #XX -- [ ]

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