The invention relates to a process for preparing niobium(V) alkoxides and
tantalum(V) alkoxides, in particular niobium(V) ethoxide and tantalum(V)
ethoxide, by reacting NbCl.sub.5 or TaCl.sub.5 with an appropriate alcohol
in the presence of ammonia, wherein NbCl.sub.5 or TaCl.sub.5 is dissolved
at a temperature of from about 0.degree. C. to -50.degree. C. in the
alcohol containing from about 5 to about 7 mol of ammonia per mol of
NbCl.sub.5 or TaCl.sub.5 to be reacted.
L'invenzione riguarda un procedimento per la preparazione gli alcossidi del niobium(V) e degli alcossidi del tantalum(V), in particolare ethoxide del niobium(V) ed ethoxide del tantalum(V), reagendo NbCl.sub.5 o TaCl.sub.5 con un alcool adatto in presenza di ammoniaca, in cui NbCl.sub.5 o TaCl.sub.5 รจ dissolto ad una temperatura circa da 0.degree. C. a -50.degree. C. nell'alcool che contiene da circa 5 a circa 7 mol di ammoniaca per il mol di NbCl.sub.5 o di TaCl.sub.5 da reagire.
