Ansa-metallocene compound, process of preparing the same, and process of preparing polyolefin using the same

A bridged metallocene compound represented by Formula 1 below:

• wherein R1, R2, R3 and R4 are each independently a hydrogen atom, an alkyl group of 1-20 carbon atoms, an alkoxy group of 1-10 carbon atoms, an aryl group of 6-20 carbon atoms, an aryloxy group of 6-10 carbon atoms, an alkenyl group of 2-20 carbon atoms, an alkylaryl group of 7-40 carbon atoms, an arylalkyl group of 7-40 carbon atoms, an arylalkenyl group of 8-40 carbon atoms, an alkynyl group of 2-10 carbon atoms, or a hydrocarbyl-substituted Group XIV metalloid radical, provided that R1 and R2 are not hydrogen at the same time, and R3 and R4 may be connected by an alkylidyne radical containing an alkyl moiety of 1-20 carbon atoms or an aryl moiety of 6-20 carbon atoms to form a ring;
• Q1 and Q2 are each independently a halogen atom, an alkyl group of 1-20 carbon atoms, an alkenyl group of 2-10 carbon atoms, an alkylaryl group of 7-40 carbon atoms, an arylalkyl group of 7-40 carbon atoms, an aryl group of 6-20 carbon atoms, a substituted or unsubstituted alkylidene group of 1-20 carbon atoms, a substituted or unsubstituted amino group, an alkylalkoxy group of 2-20 carbon atoms, or an arylalkoxy group of 7-40 carbon atoms;
• B is a carbon, silicon, germanium, phosphorus, or nitrogen atom;
• and M is a Group IV transition metal.