Copper-catalyzed highly efficient ester formation from carboxylic acids/esters and formates
作者:Jun Liu、Changdong Shao、Yanghui Zhang、Guangfa Shi、Shulei Pan
DOI:10.1039/c4ob00193a
日期:——
A highly efficient copper-catalyzed protocol for the synthesis of esters has been developed from formates. This protocol is applicable to reactions with either esters or acids as the substrates, and shows broad substrate scopes and high yields.
PPh<sub>3</sub>
/Selectfluor-Mediated Transformation of Carboxylic Acids into Acid Anhydrides and Acyl Fluorides and Its Application in Amide and Ester Synthesis
An efficient synthesis of acid anhydrides or acyl fluorides mediated by PPh3/Selectfluor synstem is reported. Mechanistic studies show that the reaction proceeds through active species of acyloxyphosphonium ions, which can be quickly converted into the final products in situ by a second carboxylicacid or F–.
Solvent- and Metal-free Oxidative Esterification of Aromatic Aldehydes Using Urea-2,2-dihydroperoxypropane as a New Solid Oxidant
作者:Kaveh Khosravi、Kobra Khalaji、Shirin Naserifar
DOI:10.1002/jccs.201600777
日期:2017.3
Urea‐2,2‐dihydroperoxypropane as a noble and solid gem‐dihydroperoxide derivative was used to transform various aromaticaldehydes to their corresponding benzoate derivatives in the presence of HBr under mild conditions at room temperature in high yields and short reaction times.
Solvent-Controlled Copper-Catalyzed Oxidation of Benzylic Alcohols to Aldehydes and Esters
作者:Yefeng Zhu、Yunyang Wei
DOI:10.1002/ejoc.201300668
日期:2013.7
copper-catalyzed selectiveoxidation of primary alcohols to esters and aldehydes was developed. Under solvent-free conditions, self-oxidative esterification and cross-esterification of benzylalcohols with various aliphatic alcohols proceed smoothly to give the corresponding esters in good yields. If DMF was used as a solvent, the benzylalcohols were selectively converted into the corresponding aldehydes in excellent
Internal donor structure for olefin polymerization catalysts and methods of making and using same
申请人:W.R. Grace & Co.-Conn.
公开号:US10144790B2
公开(公告)日:2018-12-04
The presently disclosed and claimed inventive concept(s) relates to solid catalyst components comprising titanium, magnesium, halogen and an internal electron donor compound having at least one ester group and at least one alkoxy group, and catalyst systems containing the catalyst solid components, organoaluminum compounds, and organosilicon compounds. The presently disclosed and claimed inventive concept(s) further relates to methods of making the catalyst components and the catalyst systems, and methods of polymerizing or copolymerizing alpha-olefins using the catalyst systems.