Syntheses and reactivity of oxo niobocene complexes Cp*2Nb(O)X (X=H, OCH3) and crystal structures of [Cp*2Nb(OH)F]BF4 and Cp*2Nb(O)OC(O)H (Cp*=η5-C5Me5)

Autor:	Jean-Claude Leblanc, André Sadorge, Walter Meier, Henri Brunner, Bernd Nuber, Sandrine Rigny, Dominique Lucas, Yves Mugnier, Claude Moïse, Joachim Wachter
Rok vydání:	1998
Předmět:	Stereochemistry Organic Chemistry Protonation Crystal structure Electrochemistry Biochemistry Medicinal chemistry Ion Inorganic Chemistry chemistry.chemical_compound chemistry Materials Chemistry Reactivity (chemistry) Formate Physical and Theoretical Chemistry Fluoride Stoichiometry
Zdroj:	Journal of Organometallic Chemistry. 566:203-210
ISSN:	0022-328X
DOI:	10.1016/s0022-328x(98)00746-3
Popis:	Reaction of Cp*2NbCl2 (Cp*=η5-C5Me5) with KOH or Ba(OH)2·8H2O in THF forms the complexes Cp*2Nb(O)X (X=Cl: 2, H: 3). The ratio of 2 and 3 depends on the stoichiometry. If NaOMe is added or MeOH in solution Cp*2Nb(O)OMe 4 is formed in good yields. Reactivity studies with 3 and 4 show that the NbO as well as the Nb–X unit behave as chemically active sites. Protonation of 3 or 4 with HBF4 is followed by an attack of fluoride (from BF4− anion) to give [Cp*2Nb(OH)F]BF4 6 and [Cp*2NbF2]BF4 7. In contrast the reaction of 3 or 4 with HCO2H results in an exchange of X− by formate to give Cp*2Nb(O)OC(O)H 8. The crystal structures of 6 and 8 are reported. Electrochemical investigations of 2–4 and 7, 8 reveal reaction pathways for the transformation of 1 into 3.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5eaf3c7c1b3e76a3229bcf5debd9db12 https://doi.org/10.1016/s0022-328x(98)00746-3 Zobrazit plný text záznamu Full Text from ScienceDirect