Sustainable Production of o-Xylene from Biomass-Derived Pinacol and Acrolein was written by Hu, Yancheng;Li, Ning;Li, Guangyi;Wang, Aiqin;Cong, Yu;Wang, Xiaodong;Zhang, Tao. And the article was included in ChemSusChem in 2017.Safety of 1-ethyl-2,3-dimethylimidazolium chloride This article mentions the following:
O-Xylene (OX) is a large-volume commodity chem. that is conventionally produced from fossil fuels. In this study, an efficient and sustainable two-step route is used to produce OX from biomass-derived pinacol and acrolein. In the first step, the phosphotungstic acid (HPW)-catalyzed pinacol dehydration in 1-ethyl-3-methylimidazolium chloride ([emim]Cl) selectively affords 2,3-dimethylbutadiene. The high selectivity of this reaction can be ascribed to the H-bonding interaction between Cl– and the hydroxy group of pinacol. The stabilization of the carbocation intermediate by the surrounding anion Cl– may be another reason for the high selectivity. Notably, the good reusability of the HPW/[emim]Cl system can reduce the waste output and production cost. In the second step, OX is selectively produced by a Diels-Alder reaction of 2,3-dimethylbutadiene and acrolein, followed by a Pd/C-catalyzed decarbonylation/aromatization cascade in a one-pot fashion. The sustainable two-step process efficiently produces renewable OX in 79 % overall yield. Analogously, biomass-derived crotonaldehyde and pinacol can also serve as the feedstocks for the production of 1,2,4-trimethylbenzene. In the experiment, the researchers used many compounds, for example, 1-ethyl-2,3-dimethylimidazolium chloride (cas: 92507-97-6Safety of 1-ethyl-2,3-dimethylimidazolium chloride).
1-ethyl-2,3-dimethylimidazolium chloride (cas: 92507-97-6) belongs to imidazole derivatives. The solubility of imidazoles in ethers is lower than that in alcohols and decreases with increasing chain length of the ethers . In contrast, the solubility of benzimidazoles in alcohols (C3–C6) is higher than in water and generally decreases with a Imidazole based anticancer drug find applications in cancer chemotherapy. It is used as buffer component for purification of the histidine tagged recombinant proteins in immobilized metal-affinity chromatography (IMAC).Safety of 1-ethyl-2,3-dimethylimidazolium chloride
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem