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First developed by Nishiyama in 1989 for the Rh-catalyzed hydrosilylation of aryl ketones,14they have been used effectively in a wide range of asymmetric carbon\u2212carbon bond-forming reactions.15Most relevant to the present study, Aspinall and Greeves disclosed very recently that a complex of Ph-pybox and YbCl3catalyzed the addition of TMSCN to benzaldehyde to yield the corresponding trimethylsilylcyanohydrin adduct in 89% ee and 61% yield.16"},{"key":"ol005721hb00014\/ol005721hb00014_1","doi-asserted-by":"crossref","first-page":"846","DOI":"10.1021\/om00105a047","volume":"8","author":"Nishiyama H.","year":"1989","journal-title":"Organometallics"},{"key":"ol005721hb00014\/ol005721hb00014_2","doi-asserted-by":"crossref","first-page":"500","DOI":"10.1021\/om00048a029","volume":"10","author":"Nishiyama H.","year":"1991","journal-title":"Organometallics"},{"key":"ol005721hb00014\/ol005721hb00014_3","doi-asserted-by":"crossref","first-page":"4306","DOI":"10.1021\/om00060a057","volume":"11","author":"Nishiyama H.","year":"1992","journal-title":"Organometallics"},{"key":"ol005721hb00015\/ol005721hb00015_1","doi-asserted-by":"crossref","first-page":"669","DOI":"10.1021\/ja9829822","volume":"121","author":"Evans D. 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