Patent ID: 8629292
Filing Date: 2014-01-14
Classification: C07F

Abstract:
1. A method of making a stereo-enriched ansa-metallocene compound having formula (I): the method comprising: reacting a compound having formula (II): with an unchelated amine compound having formula (III): 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 each R 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 each X independently is triflate, a halide, or a sulfonate; and each L independently is a neutral Lewis base donor ligand.