Patent ID: 7273943
Filing Date: 2007-09-25
Classification: C07C,C07F

Abstract:
1. Process for the preparation of high-purity metal alkoxides M(OR) x , in which M is Nb, Ta, Zr or Hf, x is 5 in the case of M=Nb or Ta and 4 in the case of M=Zr or Hf, and R independently of one another are identical or different C 1 -C 12 -alkyl radicals, wherein (a) a crude metal alkoxide product M(OR) (b) at most 30 wt. % based on the total amount of crude alkoxide, of an alcohol ROH, in which R is a C (c) subsequently or simultaneously an excess of ammonia, based on the amount of mononuclear or polynuclear halogen-containing metal alkoxides, based on the total amount of crude alkoxide, is metered in.