1: With n-butyllithium; N,N,N',N',tetramethyl-ethylenediamine in tetrahydrofuran; hexane T=-76 - 20°C; P=760.051 Torr; Inert atmosphere; 2: With boric acid trimethyl ester in tetrahydrofuran; hexane T=0 - 20°C; 3: With hydrogenchloride; water in tetrahydrofuran; hexane T=0°C;