Liu Kai, Liu Chun
State Key Laboratory of Fine Chemicals, Dalian University of Technology Linggong Road 2 Dalian 116024 China
RSC Adv. 2021 Nov 4;11(57):35711-35717. doi: 10.1039/d1ra06676e.
A mild and highly efficient approach has been developed for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO under low initial pressure. The key to a successful transformation is the use of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), CHBr 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 CHBr 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.
已开发出一种温和且高效的方法，用于在低初始压力下由甲醇和一氧化碳直接合成碳酸二甲酯（DMC）。成功转化的关键是使用1,8 - 二氮杂双环[5.4.0]十一碳 - 7 - 烯（DBU）、CHBr和离子液体。在优化的反应条件下，在0.25 MPa压力下碳酸二甲酯的产率高达81%。使用CHBr和DBU可在常压下进行碳酸二甲酯的直接合成。在这种情况下，反应后，经乙醇中的氢氧化钾处理后，DBU被证明可回收利用。此外，根据实验结果提出了该合成反应的合理机理。
