1: 4,4,5,5-tetramethyl-[1,3,2]dioxaborolane With bis(η4-1,5-cyclooctadiene)-di-μ-methoxy-diiridium(I) in pentane T=20°C; 0.166667 - 0.25 h; 2: With 4,4'-di-tert-butyl-2,2'-dipyridyl in pentane 0.333333 h; 3: 4-bromo-1-methyl-1H-pyrazole T=20°C; 5 h; Product distribution / selectivity;