When complexed by selected ligands in either the BIPHEP or the SEGPHOS series, CuH is an extremely reactive catalyst capable of effecting asymmetric hydrosilylations of aromatic ketones at temperatures between -50 and -78degreesC. Inexpensive silanes serve as stoichiometric sources of hydride. Substrate-to-ligand ratios exceeding 100,000: 1 have been documented. The level of induction is usually in the > 90% ee category. The nature of the reagent has been investigated using spectroscopic and chemical means, although its composition remains unclear.