Anionic hafnium species: an active catalytic intermediate for the coupling of epoxides with CO<sub>2</sub>?
作者:Ralte Lalrempuia、Jarl Underhaug、Karl W. Törnroos、Erwan Le Roux
DOI:10.1039/c9cc02695a
日期:——
A series of hafnium complexes were structurally identified showing high activity (up to 500 h−1) in the selective alternated copolymerization of epoxides with CO2 under low pressure.
在结构上鉴定出一系列of络合物,在低压下环氧化物与CO 2的选择性交替共聚中显示出高活性(长达500 h -1)。
Dramatic Behavioral Differences of the Copolymerization Reactions of 1,4-Cyclohexadiene and 1,3-Cyclohexadiene Oxides with Carbon Dioxide
作者:Donald J. Darensbourg、Wan-Chun Chung、Andrew D. Yeung、Mireya Luna
DOI:10.1021/acs.macromol.5b00172
日期:2015.3.24
copolymerization of 1,3-cyclohexadiene oxide (1,2-epoxy-3-cyclohexene) with CO2 in the presence of the binary catalyst (salen)CoX or (salen)CrX and onium salts was shown to selectively afford the completely alternating copolymer poly(1,3-cyclohexadiene carbonate) in good yield. In the process catalyzed by the cobalt(III) system, the reaction was 100% selective for copolymer, whereas employing the higher temperature
Redox Reaction of the Pd0 Complex Bearing the Trost Ligand with meso-Cycloalkene-1,4-biscarbonates Leading to a Diamidato PdII Complex and 1,3-Cycloalkadienes: Enantioselective Desymmetrization Versus Catalyst Deactivation
作者:Vasily N. Tsarev、Dennis Wolters、Hans-Joachim Gais
DOI:10.1002/chem.200902739
日期:——
O‐nucleophiles and presumably proceeds through the hydrogen carbonate 17 b as key intermediate. The intermediate formation of 17 b is also indicated by the conversion of alcohol rac‐6 b to carbonate 12 b upon treatment with HCO3− and 1. The Pd0‐catalyzed desymmetrization of 5 b with formation of 12 b and its hydrolysis allow an efficient enantioselective synthesis of diol 13 b. The reaction of the seven‐membered
Chemically recyclable oxygen-protective polymers developed by ring-opening metathesis homopolymerization of cyclohexene derivatives
作者:Kyungmin Choi、Soon Hyeok Hong
DOI:10.1016/j.chempr.2023.05.038
日期:2023.9
The ring-opening metathesis polymerization (ROMP) of six-membered cyclic olefins has been a long-standing challenge due to their low ring strain energies (RSEs). Here, we achieved the homopolymerization of cyclohexene derivatives to produce oxygen-enriched, chemically recyclable polymers. The polymerization was enabled by utilizing elaborately designed cyclohexene monomers to increase the ring strain