A method of making a stereo-enriched ansa -metallocene compound having formula: E(CpR A n) 2 M(NR 2) m, the method comprising: reacting a compound having formula: E(C p R A n) 2 M A 2 with an unchelated amine compound having formula: M(NR 2) m X p L q; wherein: M is Ti, Zr, Hf, Cr, Sc, Y, La, or a lanthanide; Cp is a cyclopentadienyl, indenyl, or fluorenyl group; E is a substituted or unsubstituted bridging chain of 3 to 8 carbon atoms or 2 to 8 silicon, germanium, or tin atoms, wherein any substituents on atoms of the bridging chain independently are H or a hydrocarbyl group having up to 18 carbon atoms; each R independently is H, a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms, or each NR 2 group is a heterocyclic group having up to 18 carbon atoms; each R A independently is H or a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms; m is 2, p is 2, and q is 0, 1, or 2 when M is Ti, Zr, or Hf; m is 1, p is 2, and q is 0, 1, 2, or 3 when M is Cr, Sc, Y, La, or a lanthanide; n is 0, 1, 2, 3, or 4 when Cp is an indenyl group; n is 1, 2, 3, or 4 when Cp is a cyclopentadienyl or a fluorenyl group; each M A independently is Li, Na, K, SiR B 3, A1R B 2, SnR B 3, 1⁄2 Mg, 1⁄2 Zn, MgX, or ZnX, wherein R B is an alkyl group having up to 18 carbon atoms; each X independently is triflate, a halide, or a sulfonate; and each L independently is a neutral Lewis base donor ligand. reacting a compound having formula: E(C p R A n) 2 M A 2 with an unchelated amine compound having formula: M(NR 2) m X p L q; wherein: M is Ti, Zr, Hf, Cr, Sc, Y, La, or a lanthanide; Cp is a cyclopentadienyl, indenyl, or fluorenyl group; E is a substituted or unsubstituted bridging chain of 3 to 8 carbon atoms or 2 to 8 silicon, germanium, or tin atoms, wherein any substituents on atoms of the bridging chain independently are H or a hydrocarbyl group having up to 18 carbon atoms; each R independently is H, a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms, or each NR 2 group is a heterocyclic group having up to 18 carbon atoms; each R A independently is H or a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms; m is 2, p is 2, and q is 0, 1, or 2 when M is Ti, Zr, or Hf; m is 1, p is 2, and q is 0, 1, 2, or 3 when M is Cr, Sc, Y, La, or a lanthanide; n is 0, 1, 2, 3, or 4 when Cp is an indenyl group; n is 1, 2, 3, or 4 when Cp is a cyclopentadienyl or a fluorenyl group; each M A independently is Li, Na, K, SiR B 3, A1R B 2, SnR B 3, 1⁄2 Mg, 1⁄2 Zn, MgX, or ZnX, wherein R B is an alkyl group having up to 18 carbon atoms; each X independently is triflate, a halide, or a sulfonate; and each L independently is a neutral Lewis base donor ligand. M is Ti, Zr, Hf, Cr, Sc, Y, La, or a lanthanide; Cp is a cyclopentadienyl, indenyl, or fluorenyl group; E is a substituted or unsubstituted bridging chain of 3 to 8 carbon atoms or 2 to 8 silicon, germanium, or tin atoms, wherein any substituents on atoms of the bridging chain independently are H or a hydrocarbyl group having up to 18 carbon atoms; each R independently is H, a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms, or each NR 2 group is a heterocyclic group having up to 18 carbon atoms; each R A independently is H or a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms; m is 2, p is 2, and q is 0, 1, or 2 when M is Ti, Zr, or Hf; m is 1, p is 2, and q is 0, 1, 2, or 3 when M is Cr, Sc, Y, La, or a lanthanide; n is 0, 1, 2, 3, or 4 when Cp is an indenyl group; n is 1, 2, 3, or 4 when Cp is a cyclopentadienyl or a fluorenyl group; each M A independently is Li, Na, K, SiR B 3, A1R B 2, SnR B 3, 1⁄2 Mg, 1⁄2 Zn, MgX, or ZnX, wherein R B is an alkyl group having up to 18 carbon atoms; each X independently is triflate, a halide, or a sulfonate; and each L independently is a neutral Lewis base donor ligand.