Patent ID: 7518008
Filing Date: 2009-04-14
Classification: C07C

Abstract:
1. A process for producing hafnium tetra-tertiary-butoxide Hf(OC 4 H 9 ) 4 , comprising the steps of: (a) adding a compound containing a carbonyl or sulfonyl group, the compound being represented by the formula of A(O wherein A is a hydrogen, oxygen, or hafnium atom, X is a carbon or sulfur atom when A is a hydrogen atom or oxygen atom, X is a sulfur atom when A is a hafnium atom, each of m, n and y is 1, when A is a hydrogen atom and X is a carbon atom, m, n and y are respectively 1, 2 and 1, when A is a hydrogen atom and X is a sulfur atom, m, n and y are respectively 2, 1 and 0, when A is an oxygen atom and X is a carbon atom, m, n and y are respectively 2, 2 and 0, when A is an oxygen atom and X is a sulfur atom, m, n and y are respectively 4, 2 and 1, when A is a hafnium atom, Rf is a C Rf is a C (b) subjecting a product of the step (a) to a distillation under reduced pressure, thereby removing the zirconium component from the crude hafnium amide; (c) adding a lithium alkylamide represented by the formula of Li(NR (d) subjecting a product of the step (c) to a distillation under reduced pressure; (e) adding tertiary butanol C (f) subjecting a product of the step (e) to a distillation under reduced pressure.