Patent ID: 8680308

Claim:
A method of producing a hafnium amide complex represented by a general formula: Hf(NR 4 R 5 ) 4 , comprising: carrying out a reduced-pressure distillation after a lithium alkylamide represented by a general formula: Li(NR 4 R 5 ) is added to and allowed to react with a tertiary hafnium alkoxide complex represented by a general formula: Hf[O(CR 1 R 2 R 3 )] 4 , wherein R 1 , R 2 and R 3 independently represent either a phenyl group, a benzyl group, or a primary, secondary or tertiary alkyl group having a carbon number 1-6; and R 4 and R 5 independently represent either a methyl group or an ethyl group; excluding all of R 1 , R 2 and R 3 being methyl groups, and excluding one of R 1 , R 2 and R 3 being an ethyl group and the other two being methyl groups.