1: 4-bromo-2-chloro-pyridine 2: pinacolboronchloride

in not given

boron trichloride in hexane; pentane T=0 - 20°C; 3 h; Inert atmosphere;

catalyst:(C5H5)Pd(C3H5)/P(C6H5)3 in toluene reaction of 2.4 equiv. of octyne with boron compd. in toluene in presence of palladium compd. and triphenylphosphine at room temp.;

in dichloromethane T=20°C; 2 h;

in pentane byproducts: B2[(OCMe2)2]3; N2-atmosphere; stirring (20°C, 1 h); filtering, distg.;

in benzene hated at 140°C for 14 h; not isolated, detected by NMR;

sulfuryl dichloride in dichloromethane

in benzene equimol., hated at 140°C for 14 h; not isolated, detected by NMR;

hydrogenchloride; methylmagnesium bromide in diethyl ether byproducts: (CH3)3B, Li(CH3)4B; (N2); a soln. of B-compound cooled with a dry ice-acetone bath; a soln.of CH3MgBr added dropwise via syringe; stirred for 0.5 h; allowed to warm to room temp. with stirring for 0.5 h; cooled to 0°C; a soln. of HCl in ether added; warmed to room temp.; detected by (11)B NMR;