Dehydrobromination of some substituted phenyl 3-bromopropionates and phenyl 3-bromothiolopropionates. Transmission of activation effects through acyl bonds
Enantioselective Pallada‐Electrocatalyzed C−H Activation by Transient Directing Groups: Expedient Access to Helicenes
作者:Uttam Dhawa、Cong Tian、Tomasz Wdowik、João C. A. Oliveira、Jiping Hao、Lutz Ackermann
DOI:10.1002/anie.202003826
日期:2020.8.3
Asymmetric pallada‐electrocatalyzed C−H olefinations were achieved through the synergistic cooperation with transient directing groups. The electrochemical, atroposelective C−H activations were realized with high position‐, diastereo‐, and enantio‐control under mild reaction conditions to obtain highly enantiomerically‐enriched biaryls and fluorinated N−C axiallychiral scaffolds. Our strategy provided
Copper Nitrate Mediated Regioselective [2+2+1] Cyclization of Alkynes with Alkenes: A Cascade Approach to Δ<sup>2</sup>-Isoxazolines
作者:Mingchun Gao、Yingying Li、Yuansheng Gan、Bin Xu
DOI:10.1002/anie.201503393
日期:2015.7.20
An efficient method for the regioselective synthesis of pharmacologically relevant polysubstituted Δ2‐isoxazolines is based on the copper‐mediated direct transformation of simple terminal alkynes and alkenes. The overall process involves the formation of four chemical bonds with inexpensive and readily available copper nitrate trihydrate as a novel precursor of nitrile oxides. The reaction can be easily
Synthesis, characterization and applications of polymer-metal chelates derived from poly[((4-acryloxy acetophenone)-divinylbenzene)] benzoyl hydrazone resins
作者:THAMMISETTY RAVI SANKAR、K KESAVULU、PEDDAKOTLA VENKATA RAMANA
DOI:10.1007/s12039-014-0611-2
日期:2014.5
polymer was treated with metalions [Cu(II), Fe(II)]. The polymer-metal complexes obtained were characterized by elemental analysis, IR, 1H-NMR, solid state 13C cross-polarization magic-angle spinning (CP/MAS) NMR, electronparamagnetic resonance (EPR), thermogravimetric and scanning electron microscopy (SEM) studies. The maximum uptake efficiency for the metalions was determined. The reusability of the
[EN] A PROCESS FOR PREPARING VANILLIN (METH)ACRYLATES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE (MÉTH)ACRYLATES DE VANILLINE
申请人:EVONIK OPERATIONS GMBH
公开号:WO2022053357A1
公开(公告)日:2022-03-17
The invention pertains to an improved process for preparing vanillin (meth)acrylates and derivatives or structurally related compounds thereof in high purity. In addition, the present invention relates to ethyl vanillin (meth)acrylate, which provides for improved room temperature crosslinking efficiency and is particularly suitable for paints/varnishes and coatings.
Compositions containing photosensitive fluorochemical and uses thereof
申请人:Liu J. Junkang
公开号:US20060199029A1
公开(公告)日:2006-09-07
In one aspect, the invention provides a fluorochemical composition comprising a mixture of: a fluorochemical selected from the formula:
wherein RF is a fluorinated group having the formula: R
f
—W—, wherein R
f
is a perfluoroalkyl or perfluoropolyether group and W is a divalent linking group; PI is a monovalent pendant organic moiety comprising benzophenone, substituted benzophenone, acetophenone, or substituted acetophenone groups;
R is H, CH
3
, or F; Rh is lower alkyl selected from the group consisting of linear or branched alkyl groups having from 1 to about 8 carbon atoms, cycloalky containing alkyl groups having from 4 to about 8 carbon atoms, and cycloalkyl groups having from 3 to about 8 carbon atoms, all optionally containing catenated O or N atoms; m is at least 2; n is at least 1; q is zero or greater; and a hydrofluoroether.