347885-97-6Relevant academic research and scientific papers
Oxorhenium(V) complexes with bis-phosphinite chelating coligands (see abstract)
Bola?o, Sandra,Bravo, Jorge,Carballo, Rosa,Freijanes, Eduardo,García-Fontán, Soledad,Rodríguez-Seoane, Pilar
, p. 1711 - 1717 (2003)
The new ligand 1,2-bis(dicyclohexylphosphinite)ethane (L1) was prepared by reaction of ethylenglycol with dicyclohexylphosphine in the presence of triethylamine. By treating this ligand with the arsine complex [ReOCl3(AsPh3)2] and trituring the formed oil with methanol, the complex [ReOCl2(OMe)L1] (1) was isolated and its crystal structure was studied by X-ray diffractometry. The coordination sphere around the Re atom is a pseudo-octahedron. The crystal structure of the previously reported complex [ReOCl3L2] (2) (L2 = 1,2-bis[diphenylphosphinite]ethane) was solved by X-ray diffractometry. When Complex 2 was refluxed in EtOH, the oxo-alkoxide complex [ReOCl2(EtO)L2] (3) was formed by a metathesis reaction. X-ray diffraction studies of Complex 3 show a pseudo-octahedral geometry around the Re atom with the oxo and ethoxy groups mutually trans. Finally, reaction of 2 with the monodentate phosphinite PPh2(OEt) ligand yielded the paramagnetic Re(III) compound [ReCl3L2{PPh2(OEt)}] (previously reported) and the new unexpected Re(V) by-product [ReOCl2(Ph2POCH2CH2O) {PPh2(OEt)}] (4). On the contrary, compounds 1 and 3 did not react with PPh2(OEt) under the same conditions.
