10522-20-0Relevant articles and documents
Selective Palladium-Catalyzed α,β-Homodiarylation of Vinyl Esters in Aqueous Medium
Brodzka, Anna,Koszelewski, Dominik,Ostaszewski, Ryszard,Trzepizur, Damian,Wilk, Monika
supporting information, p. 6028 - 6036 (2021/12/10)
A palladium-catalyzed 1,2-diarylation of vinyl esters with arylboronic acids in water has been developed. This newly elaborated protocol features a good functional group tolerance and provides one-step access to 1,2-diarylethanol derivatives under mild reaction conditions. The presented reaction can be carried out in the water at ambient temperature without the addition of any ligands, what makes this procedure environmentally benign. The transformation occurs within a single catalytic cycle and is feasible due to the modification of transition metal catalytic activity through the influence of π-acceptor olefin (benzoquinone) as well as water as a medium. Moreover, this protocol allows to generate entire compound libraries (highly profitable in medicinal chemistry) and utilizes sustainable arylboronic acids as coupling partners under mild conditions. It is also noted that the structure of boron moiety has a great impact on the reaction selectivity, the usage of sterically hindered esters of arylboronic acids influence the reaction course towards stilbenes.
Complex compound
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Paragraph 0065; 0067, (2016/10/10)
PROBLEM TO BE SOLVED: To provide a new complex compound that can be used as a catalyst for an organic synthesis reaction and in particular a surfactant type catalyst having both functions of catalytic ability and surface active ability. SOLUTION: A complex compound comprises a nitrogen-containing heterocyclic carbene ligand represented by formula (A) and including at least one metal atom selected from palladium, silver, rhodium, iridium, and ruthenium as a central metal. (R1 represents a divalent hydrocarbon group that has 2-20 carbon atoms and may include at least one atom selected from N, O, S and halogen atoms; R2 represents a hydrocarbon group having 6-70 carbon atoms and including a polyoxyalkylene group and/or a polyglyceryl group having a polymerization number of 2-20 or a hydrocarbon group having 2-20 carbon atoms and including at least one ionic functional group selected from a sulfonic acid group, a carboxyl group, an ammonium group, or their salts; and R3 represents a hydrocarbon group having 2-20 carbon atoms) SELECTED DRAWING: None COPYRIGHT: (C)2016,JPO&INPIT
A novel silver nanoparticle embedded mesoporous polyaniline (mPANI/Ag) nanocomposite as a recyclable catalyst in the acylation of amines and alcohols under solvent free conditions
Mandi, Usha,Roy, Anupam Singha,Banerjee, Biplab,Islam, Sk. Manirul
, p. 42670 - 42681 (2015/02/19)
A mesoporous polyaniline/silver (mPANI/Ag) nanocomposite has been prepared using mesoporous organic polymer polyaniline with silver nitrate via radical polymerization of aniline monomer in the presence of hydrochloric acid. The mPANI/Ag nanocomposite has been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectra (EDX), Fourier transform infrared spectroscopy (FT-IR), and ultraviolet-visible absorption spectra (UV-vis). The XRD patterns indicated that the crystalline phase of Ag is cubic. TEM images show that the Ag nanoparticles are well dispersed in the mesoporous polyaniline matrix. The mPANI/Ag acts as an efficient heterogeneous nanocatalyst in the acylation of substituted amines and alcohols using acetic acid. The catalyst is air-stable, inexpensive, easy to prepare and can be reused several times without a significant decrease in activity and selectivity. This journal is
