byproducts: H2; heating of the diborane and the phosphinoylborane to 120°C, stirring for 2 h, cooling to 20°C, all steps under exclusion of air and moisture; monitored by NMR;

heating of the diborane and the phosphinoylborane to 120°C, stirring for 2 h, cooling to 20°C, all steps under exclusion of air and moisture; monitored by NMR;