Preparation and reactivity with azo-species of hydride and dihydrogen complexes of osmium stabilised by tris(pyrazolyl)borate and phosphite ligands

The synthesis of hydride and dihydrogen complexes of osmium with phosphite and tris(pyrazolyl)borate as supporting ligands is described. Reactivity studies towards aryldiazonium cations and organic azide allow the first organometallic diazo complexes of osmium to be prepared.