Editing Kaminsky catalyst (section)

==Catalyst development==
The catalyst is named after German chemist [[Walter Kaminsky]], who first described it in 1980 along with Hansjörg Sinn and others.<ref>{{Cite journal |last=Kaminsky |first=Walter |date=2004-08-15 |title=The discovery of metallocene catalysts and their present state of the art |url=https://onlinelibrary.wiley.com/doi/10.1002/pola.20292 |journal=Journal of Polymer Science Part A: Polymer Chemistry |language=en |volume=42 |issue=16 |pages=3911–3921 |doi=10.1002/pola.20292 |issn=0887-624X|url-access=subscription }}</ref><ref>{{Cite journal |last=Sinn |first=Hansjörg |last2=Kaminsky |first2=Walter |last3=Vollmer |first3=Hans‐Jürgen |last4=Woldt |first4=Rüdiger |date=1980 |title=“Living Polymers” on Polymerization with Extremely Productive Ziegler Catalysts |url=https://onlinelibrary.wiley.com/doi/10.1002/anie.198003901 |journal=Angewandte Chemie International Edition in English |language=en |volume=19 |issue=5 |pages=390–392 |doi=10.1002/anie.198003901 |issn=0570-0833|url-access=subscription }}</ref> Prior to Kaminsky's work, titanium chlorides supported on various materials were widely used (and still are) as heterogeneous catalysts for alkene polymerization. These halides are typically activated by treatment with [[trimethylaluminium]]. Kaminsky discovered that titanocene and related complexes emulated some aspects of these [[Ziegler–Natta catalyst]]s but with low activity. He subsequently found that high activity could be achieved upon activation of these metallocenes with methylaluminoxane (MAO). The MAO serves two roles: (i) alkylation of the metallocene halide and (ii) abstraction of an anionic ligand (chloride or methyl) to give an electrophilic catalyst with a labile coordination site.<ref name=Kaminsky/><ref name=chen>{{cite journal | title =  Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure-Activity Relationships |author1=Chen, E. Y.-X. |author2=Marks, T. J. | journal = [[Chem. Rev.]] | year = 2000 | volume = 100 | issue = 4 | pages = 1391–1434 | doi = 10.1021/cr980462j | pmid=11749269|s2cid=26845820 }}</ref>