利用动力学和同位素效应,在均相和非均相催化剂上研究了丁醇与糠醛的串联脱氢和醛醇缩合反应。在均相体系中,Ni(dppe)Cl 2催化丁醇向糠醛的转移脱氢,而丁醛和糠醛的醛醇缩合发生在碱性K 2 CO 3助催化剂上。在非均相体系中,无过渡金属的混合Mg-Al氧化物,转移加氢和羟醛缩合均发生在催化剂的碱性位点上,而决定速率的步骤是从丁醇到丁二烯的α-氢化物转移。糠醛。
Versatile catalysis of iron: tunable and selective transformation of biomass-derived furfural in aliphatic alcohol
作者:Zhenya Zhang、Xinli Tong、Haigang Zhang、Yongdan Li
DOI:10.1039/c8gc00852c
日期:——
valorization of biomass-derived furfural (FUR) in aliphatic alcohols is developed in which productselectivity can be simply regulated by varying the gas atmosphere. In the presence of molecular oxygen, there is oxidative condensation of FUR with ethanol, and the obtained product is furan-2-acrolein in a “FUR-ethanol-O2” system. Under suitable conditions, the conversion of FUR and selectivity of furan-2-acrolein
after being reused five times. Moreover, the oxidative condensation of FUR with various aliphaticalcohols including ethanol, isopropanol, n-butanol and n-hexanol was studied where the long chain alcoholic molecule hinders the proceeding of reaction. Finally, based on the experimental results and reaction phenomena, a possible mechanism for the oxidative condensation of FUR with n-propanol-O2 is proposed
Herein, we report the development of an efficient green procedure for synthesizing carbonyl furanderivatives by dehydrogenative coupling of furfuryl alcohol with carbonyl compounds. The reaction is performed under mild reaction conditions in the presence of iPrPNP-Mn as the catalyst and a weak base (Cs2CO3). A range of ketones and aldehydes were efficiently diversified with furfuryl alcohol to afford
在此,我们报告了通过糠醇与羰基化合物的脱氢偶联来合成羰基呋喃衍生物的高效绿色工艺的开发。该反应在温和的反应条件下在iPr PNP-Mn 作为催化剂和弱碱 (Cs 2 CO 3 ) 的存在下进行。一系列酮和醛与糠醇有效地分离,以良好的分离收率提供呋喃基取代的饱和酮和 α,β-不饱和酮和醛。