88754-66-9Relevant articles and documents
Synthesis method of dialkyl - α, ω - alkylene glycol and application thereof in carbon dioxide absorption (by machine translation)
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Paragraph 0035-0036; 0038, (2019/10/01)
Belonging to the technical field of carbonate materials, the invention belongs to the technical field of carbonate materials. The invention relates to a synthesis method of dialkyl - α, ω - alkylene glycol and application. The synthetic method for the existing dialkyl - α, ω -alkylene glycol has the disadvantages low process efficiency, no environmental protection and the like. The technical scheme is as follows: the aliphatic diol, the dialkyl carbonate and the solid base catalyst are mixed, and under the normal pressure condition, the reaction, and the dialkyl - α, ω -alkylene dicarbonate. In addition, the invention also provides a dialkyne - α. Ω - alkylene dicarbonate is applied to a method of carbon dioxide absorption. The invention is suitable for industries medicines, cosmetics, perfumes, electrolytes, biomedicines, polymers and the like. (by machine translation)
Carbonate phosphonium salts as catalysts for the transesterification of dialkyl carbonates with diols. The competition between cyclic carbonates and linear dicarbonate products
Selva, Maurizio,Caretto, Alessio,Noe, Marco,Perosa, Alvise
, p. 4143 - 4155 (2014/06/10)
At 90-120 °C, in the presence of methylcarbonate and bicarbonate methyltrioctylphosphonium salts as catalysts ([P8881][A]; [A] = MeOCO2 and HOCO2), the transesterification of non-toxic dimethyl- and diethyl-carbonate (DMC and DEC, respectively) with 1,X-diols (2 ≤ X ≤ 6) proceeds towards the formation of cyclic and linear products. In particular, 1,2-propanediol and ethylene glycol afford propylene- and ethylene-carbonate with selectivity and yields up to 95 and 90%, respectively; while, the reaction of DMC with higher diols such 1,3-butanediol, 2-methyl-1,3-propanediol, 1,3-propanediol, 2,2-dimethyl, 1,3-propanediol, 1,4-butanediol and 1,6-hexanediol produce linear C8-C10 dicarbonates of general formula MeOC(O)O～～～OC(O)OMe as the almost exclusive products. Of note, these dicarbonate derivatives are not otherwise accessible in good yields by other conventional base catalyzed methods. Among 1,3-diols, the only exception was 2-methyl 2,4-pentandiol that yields the corresponding cyclic carbonate, i.e. 4,4,6-trimethyl-1,3-dioxan-2-one. In no one case, polycarbonates are observed. Such remarkable differences of product distributions are ascribed to the structure (branching and relative position of OH groups) of diols and to the role of cooperative (nucleophilic and electrophilic) catalysis which has been proved for onium salts. The investigated carbonate salts are not only effective in amounts as low as 0.5 mol%, but they are highly stable and recyclable. This journal is the Partner Organisations 2014.
