Solar energy assisted synthesis of palladium nanoplates and its application in 2-phenoxy-1,1′-biphenyls and N,N-dimethyl-[1,1′-biphenyl] derivatives synthesis
作者:Aniruddha B. Patil、Bhalchandra M. Bhanage
DOI:10.1016/j.molcata.2013.07.012
日期:2013.11
Present work aims to develop a greener approach for the palladium nanoplates (PdNPs) synthesis and its catalytic applications. The protocol deals with solar energy assisted ionic palladium reduction in the presence of polyvinylpyrrolidone (PVP) and ethylene glycol (EG) with a good shape selectivity. Polyvinylpyrrolidone plays a duel role of capping agent and mild reductant; whereas, ethylene glycol acts as a reductant and solvent. The optimum sunlight concentration is a key factor to the anticipated nanoplate's synthesis. Results show that the most of nanoparticles are hexagonal and triangular nanoplates in the range of 20-50 nm. This is a first report which shows similar to 70% selectivity to the nanoplates formation using sun light. The study also covers it's catalytic application, wherein; 2-phenoxy-1,1'-biphenyls and N,N-dimethyl-[1,1'-biphenyl] derivatives were synthesized by a simple, ligand free, faster, one pot, ecological and economic protocol in aqueous medium. The catalyst shows better performance than that of conventionally available 10% Pd/C catalyst. The prepared PdNPs showed excellent catalytic performance to the desired products with recyclability. (C) Elsevier B.V. All rights reserved.
Polyvinylpyridine, a Versatile Solid Phase for Coordinative Immobilisation of Palladium Precatalysts - Applications in Suzuki-Miyaura Reactions
The immobilisation of an oxime-based palladacycle on polyvinylpyridine (PVP) resin affords a reusable, air, moisture and thermally stable palladium precatalyst which exerts high activity in Suzuki-Miyaura reactions both in batch as well as continuous-flow processes. Evidence is presented which shows that, besides serving as an anchor for the precatalyst, PVP also acts as a scavenger for Pd particles present in solution.
New Atglistatin closely related analogues: Synthesis and structure-activity relationship towards adipose triglyceride lipase inhibition
作者:Pierre-Philippe Roy、Kenneth D'Souza、Miroslava Cuperlovic-Culf、Petra C. Kienesberger、Mohamed Touaibia
DOI:10.1016/j.ejmech.2016.04.021
日期:2016.8
Adipose TriglycerideLipase (ATGL) performs the first and rate-limiting step in lipolysis by hydrolyzing triacylglycerols stored in lipid droplets to diacylglycerols. By mediating lipolysis in adipose and non-adipose tissues, ATGL is a major regulator of overall energy metabolism and plasma lipid levels. Since chronically high levels of plasma lipids are linked to metabolic disorders including insulin