61696-07-9Relevant academic research and scientific papers
Synthesis of glycol diesters through the depolymerization of polyethylene glycols with carboxylic acids using a proton-exchanged montmorillonite catalyst
Maeno, Zen,Midogochi, Kaoru,Mitsudome, Takato,Mizugaki, Tomoo,Jitsukawa, Koichiro
supporting information, p. 832 - 835 (2018/02/06)
A convenient and sustainable method for the synthesis of glycol diesters was developed through the depolymerization of polyethylene glycols (PEGs) with carboxylic acids using proton-exchanged montmorillonite as an efficient solid acid catalyst. Several functionalized glycol diesters were obtained in good yields from PEGs and readily available carboxylic acids. Upon reaction completion, the catalyst could be easily separated by filtration and reused with its activity remaining unchanged.
Practical: In situ -generation of phosphinite ligands for palladium-catalyzed carbonylation of (hetero)aryl bromides forming esters
Wang, Lin,Neumann, Helfried,Spannenberg, Anke,Beller, Matthias
supporting information, p. 7469 - 7472 (2017/07/12)
An effective method for alkoxycarbonylation of (hetero)aryl bromides is developed in the presence of in situ-generated phosphinite ligands tBu2POR (R = nBu, nPr, Et or Me). For this purpose commercially available tBu2PCl was used as the pre-ligand in the presence of different alcohols. For the first time cross coupling reactions with two alcohols-one generating the ligand, the other used as substrate-were developed. Through this method, ligand optimization can be performed in a more efficient manner and the desired products could be obtained with good yields and selectivity.
THE EFFECT OF THE SUBSTITUTION ON THE CONFORMATION IN PARA-SUBSTITUTED ETHYLENE GLYCOL DIBENZOATE MOLECULES
Deguire, Suzanne,Brisse, Francois
, p. 2545 - 2552 (2007/10/02)
The series of ethylene glycol di-para-X-benzoates, when X = Me, OMe, CN, and NO2, has been studied by infrared spectroscopy and solid state CP/MAS 13C nuclear magnetic resonance.The crystal structures were established for X = Me and OMe.Bond distances, bo
m-Chloroperbenzoic Acid Oxidation of Dioxins and Dihydrodioxins
Lopez, Luigi,Calo, Vincenzo,Fiorento, Michele
, p. 457 - 460 (2007/10/02)
The m-chloroperbenzoic acid (MCPBA) oxidation of dihydrodioxins affords, in high yield, ethylene glycol dibenzoates, via unstable epoxy diethers.These elusive intermediates have been characterized chemically and by 1H n.m.r. spectroscopy.In contrast, the MCPBA oxidation of 2,3,5,6-tetraphenyl-p-dioxin fails to give the corresponding (Z)-stilbenediol dibenzoate but yields instead benzil.
SUBSTITUENT EFFECTS ON THE DECOMPOSITION OF 1,2-DIOXETANES: A HAMMETT CORRELATION FOR SUBSTITUTED 1,6-DIARYL-1,5,7,8-TETRAOXABICYCLOY4.2.0(OCTANES
Schaap, Paul A.,Gagnon, Steven D.,Zaklika, K. A.
, p. 2943 - 2946 (2007/10/02)
Rates of decomposition for 1,2-dioxetanes obtained from addition of singlet oxygen to substituted 2,3-diaryl-1,4-dioxenes have been found to obey a Hammett relationship with ?=++-0.24 (n 15, r 0.92).The results are taken as support for a biradical mechanism.
