in further solvent(s) byproducts: mesitylene; absence of air and moisture; in C6D5Br; bubbling CO at 150°C for6 h; not isolated, reaction followed by (1)H-NMR spectroscopy;

in further solvent(s) byproducts: mesitylene; absence of air and moisture; in C6D5Br; bubbling CO at 150°C for6 h; not isolated, reaction followed by (1)H-NMR spectroscopy;

in toluene absence of air and moisture; bubbling CO at 60°C for 12 h; solvent removal (vac.); product mixt. not sepd., detd. by (1)H-NMR and IR spectroscopy;