Method of preparing metallocene catalyst for polyolefin preparation

A method of preparing a metallocene catalyst, the method comprising the steps of:

• A) forming a metallocene compound by reacting a ligand compound represented by the following Chemical Formula 1 with a zirconium compound comprising chloride in the presence of an alkyl lithium;
• B) adding a first solvent to the reaction products from step A) including the metallocene compound to form a lithium chloride—the first solvent complex;
• and
• C) adding a second solvent to the reaction products from step B) to precipitate the lithium chloride—the first solvent complex, followed by filtration:
• wherein R1 is a C6-20 aryl substituted with a C1-20 alkyl;
• R2, R3, and R4 are each independently hydrogen, a halogen, a C1-20 alkyl, a C2-20 alkenyl, a C1-20 alkylsilyl, a C1-20 silylalkyl, a C1-20 alkoxysilyl, a C1-20 ether, a C1-20 silylether, a C1-20 alkoxy, a C6-20 aryl, a C7-20 alkylaryl, or a C7-20 arylalkyl;
• A is carbon, silicon, or germanium;
• R5 is a C1-20 alkyl substituted with a C1-20 alkoxy;
• and
• R6 is hydrogen, a C1-20 alkyl, or a C2-20 alkenyl,
• wherein the first solvent is one or more selected from the group consisting of 1,4-dioxane and 1,3-dioxolane, and
• wherein the second solvent is one or more selected from the group consisting of dichloromethane, chloroform, carbon tetrachloride, benzene, and toluene.