US Patent 5,597,935
United States Patent and Trademark Office
University of Iowa Research Foundation (Oakdale, IA, US)
A process of preparing in high yield ansa-metallocene complexes and rac ansa-metallocene complexes by reacting an ansa-bis-cyclopentadiene compound with a metal amide complex.
Jordan, Richard F. and Diamond, Gary M. Synthesis of ansa-metallocene catalysts. US Patent 5,597,935 filed May 15, 1995 and issued January 28, 1997. https://ir.uiowa.edu/patents/160