Patent ID: 8263770

Claim:
A method for preparing an aluminum chelate complex for an organic EL element represented by general formula (1) which contains less than 350 wt ppm of a compound represented by general formula (2) as an impurity: in general formulas (1) and (2), Ar 1 is naphthylene, Ar 2 is naphthyl or phenyl, the total number of aromatic rings in Ar 1 and Ar 2 is 3 to 4 and these aromatic rings may be condensed; R 1 -R 6 are independently hydrogen or hydrocarbon groups containing 1-8 carbon atoms; and X is Br, Cl or I, said method comprising: reacting aluminum isopropoxide successively with a quinolinol derivative and a phenolic compound represented by HO—Ar 1 —Ar 2 which comprises purifying the quinolinol derivative and the phenolic compound in such a manner as to reduce the amount of a compound contained therein and represented by HO—Ar 1 —X to 350 wt ppm or less and then submitting them to the reaction.