Ionic liquids (ILs) based on 1,3-dialkylimidazolium and tetraalkylammonium cations were employed as a series of efficient, environmentally benign phase-transfer catalysts (PTCs) for the base-promoted monoalkylatio...Ionic liquids (ILs) based on 1,3-dialkylimidazolium and tetraalkylammonium cations were employed as a series of efficient, environmentally benign phase-transfer catalysts (PTCs) for the base-promoted monoalkylation of diethyl malonate. The influence of various heterogeneous bases on yields was studied. Good yields and high selectivity were obtained. Solvent-free, mild reaction condition, short reaction time, and easy purification were the merits of this method. The catalytic system (IL-hase) could also be recycled after the extraction of products with ether.展开更多
Alkyl methyl(ethyl) malonates were synthesized by solidliquid phase transfer catalysis without solvent in the new method of the reaction of potassium methyl(ethyl) malonate with alkyl bromide or chloride with high y...Alkyl methyl(ethyl) malonates were synthesized by solidliquid phase transfer catalysis without solvent in the new method of the reaction of potassium methyl(ethyl) malonate with alkyl bromide or chloride with high yields.Under the microwave irradiation,the reaction time was reduced from 2h to 2min with equal yield.展开更多
文摘Ionic liquids (ILs) based on 1,3-dialkylimidazolium and tetraalkylammonium cations were employed as a series of efficient, environmentally benign phase-transfer catalysts (PTCs) for the base-promoted monoalkylation of diethyl malonate. The influence of various heterogeneous bases on yields was studied. Good yields and high selectivity were obtained. Solvent-free, mild reaction condition, short reaction time, and easy purification were the merits of this method. The catalytic system (IL-hase) could also be recycled after the extraction of products with ether.
文摘Alkyl methyl(ethyl) malonates were synthesized by solidliquid phase transfer catalysis without solvent in the new method of the reaction of potassium methyl(ethyl) malonate with alkyl bromide or chloride with high yields.Under the microwave irradiation,the reaction time was reduced from 2h to 2min with equal yield.