1: 2-(2'-bromophenyl)-6-butyl[1,3,6,2]dioxazaborocan With n-butyllithium in tetrahydrofuran T=-90 - -75°C; 0.333333 h; 2: boric acid trimethyl ester T=-85°C; 0.333333 h; 3: With hydrogenchloride in water T=-30°C;