1.1: 84 percent / LiAlH4 / tetrahydrofuran / 7 h / 60 °C 2.1: 100 percent / imidazole / dimethylformamide / 20 °C 3.1: (R)-2-(o-fluorobenzyloxy)-2'-methoxy-1,1'-binaphthyl*SnCl4 / toluene / 72 h / -78 °C 3.2: ClSiEt3; imidazole / dimethylformamide / 5 h / 20 °C 3.3: TFA*SnCl4 / various solvent(s); toluene / 24 h / -78 °C View Scheme

(R)-benzyl-BINOL; tin(IV) chloride in toluene T=-78 - -20°C; 75.0833 h; optical yield given as percent eeenantioselective reaction;