542-52-9Relevant articles and documents
New Synthetic Approach to Polyfluorinated Carbonates
Ezhikova, M. A.,Kodess, M. I.,Pestov, A. V.,Semenova, A. M.,Zapevalov, A. Ya.
, (2020)
Abstract: Transesterification of commercial titanium(IV) alkoxides with2,2,3,3-tetrafluoropropan-1-ol, followed by in situ transesterification of mixedtitanium(IV) alkoxides thus formed with diphenyl carbonate, afforded alkyl2,2,3,3-tetrafluoropropyl carb
Microwave-Assisted Aminoalkylation of Phenols via Mustard Carbonate Analogues
Annatelli, Mattia,Aricò, Fabio,Castellano, Sabrina,Milite, Ciro,Trapasso, Giacomo,Viviano, Monica
supporting information, (2022/03/17)
microwave-assisted chlorine-free direct phenol substitution is presented, which is indicated as a key green chemistry research area for pharmaceuticals manufacturers. The reaction of -aminocarbonates (mustard carbonates) with several substituted phenols in the presence of a polar solvent (acetonitrile or butanol) led to the related aminoalkylated products via the anchimeric assistance of the nitrogen incorporated in the organic carbonate backbone. The aminoalkylation required short reaction time (7 min) and the related products were isolated in high yields (>90%) via quick liquid-liquid extraction or column chromatography depending on the solvent employed. Furthermore, microwave irradiation also promoted the one-pot aminoalkylation of phenol in excellent yield. In this approach a -aminoalcohol was reacted with phenol in the presence of diethyl carbonate, used for the in situ formation -aminocarbonate, key intermediate in the consequent anchimerically driven alkylation. The resulting product, namely N,N-dimethyl- 2-phenoxyethanamine, was isolated as pure in almost quantitative yield.
Synthesis of dimethyl carbonate from methanol and CO2under low pressure
Liu, Chun,Liu, Kai
, p. 35711 - 35717 (2021/12/04)
A mild and highly efficient approach has been developed for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO2 under low initial pressure. The key to a successful transformation is the use of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), CH2Br2 and ionic liquid. Under the optimized reaction conditions, the yield of DMC was obtained up to 81% under 0.25 MPa. The direct synthesis of DMC can be carried out at balloon pressure using CH2Br2 and DBU. In this case, after the reaction, DBU was proved to be recyclable after having been treated with KOH in ethanol. In addition, a plausible mechanism for this synthetic reaction was proposed according to the experimental results.
Boosting the methanolysis of polycarbonate by the synergy between ultrasound irradiation and task specific ionic liquids
D'Anna, Francesca,Sbacchi, Maria,Infurna, Giulia,Dintcheva, Nadka Tz.,Marullo, Salvatore
supporting information, p. 9957 - 9967 (2021/12/24)
In an attempt to perform polycarbonate chemical recycling in a more sustainable way, we took into consideration the combined use of ultrasound irradiation and task specific ionic liquids. Towards this aim, the methanolysis of polycarbonate, into dimethylcarbonate and bisphenol A, was carried out in the presence of cholinium-based ionic liquids featuring anions derived from amino acids and other eco-friendly species. The target process was optimized in terms of both energy and material amounts as well as in terms of the nature of the catalysts used. The proposed protocol allowed high conversion and yields of bisphenol A to be obtained, under milder conditions compared to the ones so far reported in the literature, perfectly fulfilling green chemistry principles. The best performing catalyst can be reused without significant loss in performance and the methodology can be successfully applied to post-consumer polycarbonate samples. This journal is
