1: N-benzylpyridinium hexafluorophosphate With lithium triethylborohydride in tetrahydrofuran T=-70 - 0°C; 1 h; Schlenk techniqueInert atmosphere; 2: sodium cyanide With hydrogenchloride in tetrahydrofuran; water T=0°C; pH=9.5; Schlenk techniqueInert atmosphere;

1.1: lithium triethylborohydride / tetrahydrofuran / 1 h / -70 - 0 °C / |Schlenk technique; |Inert atmosphere 1.2: 0 °C / pH 9.5 / |Schlenk technique; |Inert atmosphere 2.1: diisopropylamine; n-butyllithium / tetrahydrofuran; hexane / 2 h / -80 - 0 °C / |Schlenk technique; |Inert atmosphere 2.2: 2 h / -80 - -10 °C / |Schlenk technique; |Inert atmosphere 3.1: sodium tetrahydroborate / ethanol / 48 h / 0 °C 4.1: Wilkinson's catalyst; hydrogen / tetrahydrofuran / 72 h / 20 °C / 3750.38 Torr View Scheme