US Patent 5,495,035
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, 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.; Rodewald, Stephan; and Diamond, Gary M. Synthesis of ANSA-metallocene catalysts. US Patent 5,495,035 filed June 01, 1994 and issued February 27, 1996. https://ir.uiowa.edu/patents/150