(Tetramethyltetraazaannulene)chromium Chloride: A Highly Active Catalyst for the Alternating Copolymerization of Epoxides and Carbon Dioxide

Autor:	Shawn B. Fitch, Donald J. Darensbourg
Rok vydání:	2007
Předmět:	Inorganic chemistry Cyclohexene chemistry.chemical_element Catalysis Inorganic Chemistry Metal chemistry.chemical_compound Chromium chemistry visual_art Carbon dioxide Polymer chemistry visual_art.visual_art_medium Copolymer Carbonate Physical and Theoretical Chemistry Cyclohexene oxide
Zdroj:	Inorganic Chemistry. 46:5474-5476
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic7007842
Popis:	A tetramethyltetraazaannulene complex incorporating a chromium(III) metal center has been shown to be highly active toward the copolymerization of cyclohexene oxide and carbon dioxide to afford poly(cyclohexene carbonate) in the presence of [PPN]N3 [PPN+=bis(triphenylphosphoranylidene)ammonium] as a cocatalyst. An asymptotical rate increase was observed, leveling at 2 equiv of cocatalyst with a maximum turnover frequency of 1300 h(-1) at 80 degrees C. A benefit of this new catalyst system over that of the previously studied less-active (salen)CrX system is that the (tmtaa)CrCl catalyst has a much lower propensity toward the formation of a cyclic carbonate byproduct throughout the copolymerization reaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a73f16b57d5f24e45ad318dad680a5ce https://doi.org/10.1021/ic7007842 Zobrazit plný text záznamu