Syntheses with organoboranes. VII, monohydroboration of conjugated dienes with catecholborane catalyzed by complexes of Nickel(II) chloride and Cobalt(II) chloride with diphosphines

Article abstract of DOI:10.1016/S0040-4039(97)01691-2

The monohydroboration of representative conjugated dienes 1-7 with catecholborane in the presence of SmI₃, t-BuOSmI₂, LaI₃, Ti(OPr(i))₄, iron(II), nickel(II) and cobalt(II) chloride complexes with dppe, dppp and dppb was examined. NiCl₂(dppe), NiCl₂(dppp) and CoCl₂(dppp) shoned catalytic activity. The 1,2-addition products were obtained, no 1,4-addition was observed. The reactivity in the presence of NiCl₂(dppe) decreased in the order acyclic dienes > cyclic dienes >>1-decene.