| 摘要 |
Processes for preparing high-purity niobium alkoxides, especially niobium ethoxide, are described which include: (a) providing a crude niobium alkoxide starting material comprising at least one compound of the general formula (I) <?in-line-formulae description="In-line Formulae" end="lead"?>Nb(OR)5 (I)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein each R independently represents a linear or branched C1-12 alkyl group; and (b) contacting the crude niobium alkoxide starting material with a treatment medium comprising a component selected from the group consisting of (i) one or more alcohols of the general formula (II) in an amount of 0.01 to 5% by weight, (ii) air or an oxygen-containing gas, and (iii) combinations thereof; <?in-line-formulae description="In-line Formulae" end="lead"?>R1OH (II)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein each R1 independently represents a linear or branched C1-12 alkyl group.
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