Catalytic enantioselective synthesis of 2-aryl chromenes and related phosphoramidite ligands and catalyst compounds

A compound of a formula

• wherein R is methyl and R1 is cyclohexyl, or R and R1 together provide a divalent (CH2)m moiety, where m is an integer selected from 4-6;
• each R2 is independently selected from methyl and ethyl moieties, or where said R2 moieties together provide a divalent moiety selected from alkylene and alkyl-substituted alkylene moieties;
• and each Ar is independently selected from phenyl and substituted phenyl moieties.