1848-03-9Relevant academic research and scientific papers
Light-induced synthesis of unsymmetrical organic carbonates from alcohols, methanol and CO2under ambient conditions
Saini, Sandhya,Gour, Nand Kishor,Khan, Shafiur Rehman,Deka, Ramesh Chandra,Jain, Suman L.
supporting information, p. 12800 - 12803 (2021/12/13)
The present work describes the first visible light-assisted, metal-free and organic base 1,1,3,3-tetramethyl guanidine (TMG) mediated synthesis of unsymmetrical methyl aryl/alkyl carbonates from the reaction of alcohols, methanol, and CO2 in high to excel
Transesterification of dimethyl carbonate with phenol using Br?nsted and Lewis acidic ionic liquids
Deshmukh, Krishna M.,Qureshi, Ziyauddin S.,Dhake, Kishor P.,Bhanage, Bhalchandra M.
experimental part, p. 207 - 211 (2011/09/12)
Transesterification reaction of dimethyl carbonate with phenol to methylphenyl carbonate and diphenyl carbonate using dibutyltin oxide catalyst in conjunction with Br?nsted and Lewis acidic ionic liquids was studied. It was observed that the use of ionic liquids significantly enhances the yield of diphenyl carbonate. The ionic liquid having p-toluenesulfonate as anion and metal halide (e.g. ZnCl2) as Lewis acid precursor exhibited higher activity and selectivity for diphenyl carbonate formation. Furthermore, the Br?nsted and Lewis acidity of ionic liquids was measured by IR spectroscopy using pyridine as a probe and their Lewis acidity order was also determined.
Pentaalkylguanidines as etherification and esterification catalysts
Barcelo, Gerard,Grenouillat, Denis,Senet, Jean-Pierre,Sennyey, Gerard
, p. 1839 - 1848 (2007/10/02)
Several pentaalkylguanidines have been prepared and found to be superior catalysts for the preparation of aryl and aralkyl ethers from carbonates and for the methylation of phenols with dimethylcarbonate.They also act as effective catalysts for esterification of acids with alkyl chloroformates but not for the acetylation of tertiary alcohols with acetic anhydride.
