作者:Hatice Mutlu、Johal Ruiz、Susanne C. Solleder、Michael A. R. Meier
DOI:10.1039/c2gc35191a
日期:——
This work presents the synthesis of unsymmetric and symmetric organic carbonates as well as the synthesis of polycarbonates in an efficient and sustainable approach. All reactions were carried out at atmospheric pressure at 80 °C and the use of classic toxic and harmful chemicals, such as phosgene and carbon monoxide, was avoided. The key finding of this manuscript is that the use of 1,5,7-triazabicyclo[4.4.0]dec-5-ene, TBD, an organocatalyst, in combination with dimethyl carbonate (DMC), a non-toxic and renewable starting material, allows the synthesis of the mentioned unsymmetric carbonates in yields of up to 98% under optimized conditions. The structure of the alcohols used for this approach was found to influence the DMC–ROH ratio required to maximize the yield of the desired structure. Finally, the results obtained for the synthesis of low molecular weight building blocks could be transferred to the catalytic synthesis of high molecular weight polycarbonates.
这项研究以高效、可持续的方法合成了不对称和对称有机碳酸盐以及聚碳酸酯。所有反应都是在 80 °C 的常压下进行的,避免了使用传统的有毒有害化学品,如光气和一氧化碳。本手稿的主要发现是,使用 1,5,7-三氮杂双环[4.4.0]癸-5-烯(TBD,一种有机催化剂)与碳酸二甲酯(DMC,一种无毒且可再生的起始原料)相结合,可以在优化的条件下合成上述不对称碳酸盐,产率高达 98%。研究发现,这种方法所使用的醇的结构会影响 DMC-ROH 的比例,从而使所需结构的产率最大化。最后,合成低分子量结构单元的结果可用于催化合成高分子量聚碳酸酯。