14374-45-9Relevant articles and documents
In situ stabilization of Pd0-nanoparticles into the nanopores of modified Montmorillonite: Efficient heterogeneous catalysts for Heck and Sonogashira coupling reactions
Borah, Bibek Jyoti,Dutta, Dipak Kumar
, p. 202 - 209 (2013)
In situ generation of Pd0-nanoparticles into the nanopores of modified Montmorillonite and their catalytic performance in carboncarbon bond formation namely Heck and Sonogashira reactions, have been carried out. The modification of Montmorillonite was carried out by activating with H 2SO4 under controlled conditions for generating nanopores on the surface, which act as a 'Host' for Pd0-nanoparticles and was prepared by loading of K2PdCl4 metal precursor through incipient wetness impregnation technique followed by reduction with hydrazine hydrate. Powder-XRD, SEM-EDX, TEM, N2 adsorption, XPS, etc. analyses were carried out to characterize the stabilized nanoparticles as well as the supports. TEM study reveals that Pd0-nanoparticles of size below 10 nm were evenly distributed on the support and exhibit face centered cubic (fcc) lattice. The supported metal nanoparticles serve as efficient heterogeneous catalyst for the Heck coupling reaction in which the vinylation of aryl halides with olefins result cross-coupling products with maximum 96% isolated yield and >99% trans selectivity while in the alkynylation of aryl halides with terminal alkynes, i.e. in Sonogashira coupling reaction, a maximum of 94% isolated yield with 100% selectively cross-coupling products were observed. The nanocatalysts could be recycled and reused several times without significant loss of their catalytic activities.
A copper-free Sonogashira reaction using a Pd/MgLa mixed oxide
Cwik, Agnieszka,Hell, Zoltán,Figueras, Fran?ois
, p. 3023 - 3026 (2006)
A new Pd/MgLa mixed oxide is found to be an efficient catalyst for the Sonogashira reaction of aryl iodides, bromides and even activated chlorides in the absence of a copper salt.
Regio- And stereoselective electrochemical synthesis of sulfonylated enethers from alkynes and sulfonyl hydrazides
Du, Wu-Bo,Wang, Ning-Ning,Pan, Chao,Ni, Shao-Fei,Wen, Li-Rong,Li, Ming,Zhang, Lin-Bao
supporting information, p. 2420 - 2426 (2021/04/07)
An electrooxidative direct difunctionalization of internal alkynes with sulfonyl hydrazides has been developed for the construction of sulfonated enethers. In this transformation, metal catalysts or stoichiometric amount of oxidants are not required and molecular nitrogen and hydrogen are the sole byproducts, providing a simple and green approach for preparing various sulfonyl tetrasubstituted alkenes. Notably, the protocol could be efficiently scaled up and the follow-up procedures of the corresponding functionalized alkenes demonstrate the practicality of the electrochemical synthesis.
Synthesis of a Cellulosic Pd(salen)-Type Catalytic Complex as a Green and Recyclable Catalyst for Cross-Coupling Reactions
Sun, Peng,Yang, Jiaojiao,Chen, Chunxia,Xie, Kaijun,Peng, Jinsong
, p. 2900 - 2910 (2020/03/31)
Abstract: A green recyclable cellulose-supported Pd(salen)-type catalyst was synthesized through sequential three steps: chlorination with thionyl chloride, modification by ethylenediamine, and the formation of Schiff base with salicylaldehyde to immobilize palladium chloride through multiple binding sites. This novel heterogeneous cellulosic Pd(salen)-type catalytic complex was fully characterized by FT-IR, SEM, TEM, XPS, ICP-AES and TG. The traditional cross-coupling chemistry, such as Suzuki, Heck, Sonogashira, Buchwald–Hartwig amination and etherification, was then investigated in the presence of the above cellulose-palladium nanoparticle. Studies have shown that the synthesized catalyst shows high activity and efficiency for all types of transformations, providing the corresponding carbon–carbon or carbon–heteroatom coupling products in a general and mild manner. Furthermore, the catalyst demonstrates high to excellent yields and is easily recycled by simple filtration for up to twelve cycles without any significant loss of catalytic activity. Graphic Abstract: [Figure not available: see fulltext.]
Photoredox/Cobalt Dual Catalysis for Visible-Light-Mediated Alkene-Alkyne Coupling
Rai, Pramod,Maji, Kakoli,Maji, Biplab
supporting information, p. 3755 - 3759 (2019/05/24)
Dual photoredox transition-metal catalysis has recently emerged as a powerful tool for making synthetically challenging carbon-carbon bonds under milder reaction conditions. Herein, we report on the visible-light-mediated controlled generation of low-valent cobalt catalyst without the need for a metallic reductant. It enabled C-C bond formation via ene-yne coupling at room temperature. The generality of this dual catalysis is demonstrated via the creation of sizable molecular diversity with the accommodation of several functional groups.
