[rhodium(I)chloride(triphenylphosphine)3] in diethyl ether High Pressure; Ar; pinacolborane (2 equiv.) slowly added to a soln. of BrC3H4Br and RhCl(P(C6H5)3)3 at 20°C, placed under 13 kbar for 72 h; solvent removed (vac.), chromy. (silica gel, 80:20 heptane-ethyl acetate);

[rhodium(I)chloride(triphenylphosphine)3] in tetrahydrofuran High Pressure; Ar; pinacolborane (2 equiv.) slowly added to a soln. of BrC3H4Br and RhCl(P(C6H5)3)3 at 20°C, placed under 13 kbar for 72 h;

Ar; catecholborane (2 equiv.) added dropwise to dibromopropene, stirred at 90°C for 2 h; not isolated, detected by NMR;