Direct Synthesis of Diallyl Carbonate Via Urea Transesterification with Allyl Alcohol Over Metal Chlorides
A promising technique was studied towards diallyl carbonate (DAC) manufacture via urea transesterification with allyl alcohol over several metallic chlorides. It was revealed that the intermediate allyl carbamate (AC) was first generated via urea mono-alcoholysis with high yield, and subsequently AC further reacted with another allyl alcohol molecule to produce DAC. All the metal halides were evaluated for the overall reaction and the reaction of AC and allyl alcohol, respectively. This work found that the catalytic ability of catalysts originated from metal ions. Importantly, the highest yield of DAC could be achieved using LaCl3 as catalyst. In addition, the activation patterns of reactants were investigated using in situ FT-IR measurement. Based on the characterization results of X-ray power diffraction and elemental analysis of the lanthanum species, separated from the reaction conduced over LaCl3, a possible reaction mechanism was speculated.
KeywordsDially carbonate Urea Allyl alcohol LaCl3
This work is subsidized by Key Research and Developement Program of Shandong Province (2018GGX107010, 2017GGX70103), National Natural Science Foundation of China (51674223), Natural Science Foundation of Shandong Province (ZR2016BL21), Science and Technology Research Program for Colleges and Universities in Shandong Province (J18KA107), and National Training Programs of Innovation and Entrepreneurship for Undergraduates (201710904063 and 201710904064).
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Conflict of interest
The authors declare that they have no conflict of interest.
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