Ligand compound, transition metal compound and catalyst composition including the transition metal compound

A method of preparing a transition metal compound of Formula 1 by reacting a compound represented by the following Formula 2 with a compound represented by the following Formula 7 and an organolithium compound:

• in the above formulae,
• R1 to R6 are each independently hydrogen;
• alkyl having 1 to 20 carbon atoms;
• alkenyl having 2 to 20 carbon atoms;
• aryl having 6 to 20 carbon atoms;
• alkylaryl having 7 to 20 carbon atoms;
• or arylalkyl having 7 to 20 carbon atoms,
• R7 and R8 are each independently hydrogen;
• alkyl having 1 to 20 carbon atoms;
• alkenyl having 2 to 20 carbon atoms;
• aryl having 6 to 20 carbon atoms;
• alkylaryl having 6 to 20 carbon atoms;
• arylalkyl having 7 to 20 carbon atoms;
• alkyl amido having 1 to 20 carbon atoms;
• aryl amido having 6 to 20 carbon atoms;
• or alkylidene having 1 to 20 carbon atoms,
• R9 is hydrogen;
• alkyl having 1 to 20 carbon atoms;
• alkenyl having 2 to 20 carbon atoms;
• alkoxy having 1 to 20 carbon atoms;
• aryl having 6 to 20 carbon atoms;
• arylalkoxy having 7 to 20 carbon atoms;
• alkylaryl having 7 to 20 carbon atoms;
• or arylalkyl having 7 to 20 carbon atoms,
• at least two adjacent elements of R1 to R9 are optionally connected to each other to form a ring,
• R10 and R11 are each independently hydrogen, halogen, alkyl having 1 to 20 carbon atoms, alkenyl having 2 to 20 carbon atoms, aryl having 6 to 20 carbon atoms, alkylaryl having 7 to 20 carbon atoms, arylalkyl having 7 to 20 carbon atoms, alkylamino having 1 to 20 carbon atoms, arylamino having 6 to 20 carbon atoms, or alkylidene having 1 to 20 carbon atoms,
• Q is Si, C, N, P, or S, and
• M is a transition metal in group 7.