21230-91-1Relevant academic research and scientific papers
Methoxy Groups Increase Reactivity of Bifunctional Tetraarylphosphonium Salt Catalysts for Carbon Dioxide Fixation: A Mechanistic Study
Toda, Yasunori,Komiyama, Yutaka,Esaki, Hiroyoshi,Fukushima, Kazuaki,Suga, Hiroyuki
, p. 15578 - 15589 (2019/11/21)
The development of carbon dioxide fixation under mild conditions is a central theme in organic synthesis. Despite the tremendous progress in the field of organocatalysis in the past two decades, the coupling reactions of epoxides with carbon dioxide that proceed at atmospheric pressure at temperatures of less than 100 °C have remained challenging. In our aspirational studies of tetraarylphosphonium salts (TAPS) catalysis, we report here the bifunctional TAPS-catalyzed synthesis of five-membered cyclic carbonates by chemical fixation using 1 atm of carbon dioxide at 60 °C. Intriguing substituent effects of TAPS were observed, in which electron-donating groups enhanced their reactivity. In addition, the mechanism was thoroughly investigated by undertaking both experimental and theoretical studies, suggesting that the electronic properties of TAPS affect carbon dioxide insertion into halohydrin intermediates. The results provided fruitful information to understand the origin of the TAPS behavior, which would contribute to the design of novel catalysts for carbon dioxide capture.
Curing accelerator, epoxy resin composition, and semiconductor device
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Page 16; 30, (2008/06/13)
A curing accelerator which is suitable for various curable resin compositions, an epoxy resin composition having excellent curability, storage stability and fluidity, and a semiconductor device having excellent solder cracking resistance and moisture resi
