31732-32-8Relevant articles and documents
SYNTHESEN MIT 1-PHENYLBORA-2,5-CYCLOHEXADIEN. KOMPLEXE VON EISEN, COBALT UND NICKEL MIT TEILWEISE HYDRIERTEN BORABENZOL-LIGANDEN
Herberich, G. E.,Raabe, E.
, p. 143 - 156 (2007/10/02)
Phenylbora-2,5-cyclohexadiene (LH) is a versatile ligand precursor in reactions with Fe(CO)5, Co2(CO)8, Ni(CO)4, and Ni(η4-1,5-COD)2.Photochemical reaction with Fe(CO)5 gives (η5-LH)Fe(CO)3 which under irradiation slowly converts to the known borabenzene derivative 6-L)Fe(CO)2>2 (Fe-Fe).LH reacts with Co2(CO)8 to give the known complex (η6-L)Co(CO)2 and two isomers (η4-LH2)Co(CO)3 with the novel bora-5-cyclohexen-2-yl and bora-3-cyclohexen-2-yl ligands, respectively.Ni(CO)4 similarly yields two isomers Ni(η6-L)(η4-LH2), whereas Ni(η4-1,5-COD)2 gives Ni(η6-L)(1,4,5-η3-C8H13).Complexes with ligands of the η4-2-bora-3-buten-1-yl show strong metal-boron interactions as evidenced by a Ni-B distance of 217 pm in the corresponding isomer Ni(η6-L)(η4-LH2) and by δ(11B) values ranging from 19.6 to 24.4 ppm.In contrast to this, complexes with ligands of the type η4-1-bora-3-buten-2-yl show weak metal-boron interactions as revealed by a comparatively long Co-B distance of 248.1(7) pm in the corresponding isomer Co(CO)2(PMe3)(η4-LH2) and by δ(11B) values at significantly lower field, ranging from 41.5 to 30.8 ppm.
