A series of previously reported homoleptic and non-homoleptic N,N-dialkylcarbamates of a range of non precious metals and N,N-dialkylcarbamate of Al(III) were investigated as easily available and inexpensive catalysts in the solventless synthesis of propylene carbonate (PC) from propylene oxide (PO) and CO₂. By operating at atmospheric CO₂ pressure at ambient temperature, excellent results were achieved using Ti(O₂CNEt₂)_4, Al(O₂CNR₂)₃ (R = Et, ⁱPr), Cu(O₂CNEt₂)₂ and Sn(O₂CNEt₂)₄, in combination with NBu₄X (X = Br or Cl) as a co-catalyst. The reactions of MCl₂(O₂CNEt₂)₂ (M = Ti, Zr) with amorphous silica were straightforward through partial release of both chlorido and carbamato ligands, and readily afforded solid materials which were characterized by ICP-OES and EDS analyses, coupled to SEM. These heterogeneous catalytic systems revealed less efficient than the homogeneous counterparts.

研究了一系列先前报道的一系列非贵金属的均相和非均相的N，N-二烷基氨基甲酸酯和Al（III）的N，N-二烷基氨基甲酸酯作为无溶剂合成碳酸亚丙酯（PC时）容易获得且廉价的催化剂）由环氧丙烷（PO）和CO _2组成。通过在环境温度下在大气CO ₂压力下运行，使用Ti（O ₂ CNEt ₂）_4， Al（O ₂ CNR ₂）₃（R = Et，ⁱ Pr），Cu（O ₂ CNEt ₂）₂获得了优异的结果。和锡（O₂ CNEt ₂）₄与NBu ₄ X（X = Br或Cl）结合作为助催化剂。MCl ₂（O ₂ CNEt ₂）₂（M = Ti，Zr）与无定形二氧化硅的反应通过氯代和氨基甲酸酯配体的部分释放而直接进行，并且容易获得固体材料，其通过ICP-OES和EDS分析进行表征，耦合到SEM。这些非均相催化体系的效率低于均相催化体系。