Novel chromium-containing compounds, such as, for example, chromium pyrrolides, are prepared by forming a mixture of a chromium salt, a metal amide, and an electron pair donor solvent, such as, for example, an ether. These novel chromium-containing, or chromium pyrrolide, compounds can be used either...http://www.google.es/patents/US5376612?utm_source=gb-gplus-sharePatente US5376612 - Chromium catalysts and process for making chromium catalysts
Chromium catalysts and process for making chromium catalysts
