Oxidation of non-phenolic β-O-aryl-lignin model dimers catalysed by lignin peroxidase. Comparison with the oxidation induced by potassium 12-tungstocobalt(III)ate
Oxidation of non-phenolic β-O-aryl-lignin model dimers catalysed by lignin peroxidase. Comparison with the oxidation induced by potassium 12-tungstocobalt(III)ate
Synergistic dual activation catalysis by palladium nanoparticles for epoxide ring opening with phenols
作者:Kapileswar Seth、Sudipta Raha Roy、Bhavin V. Pipaliya、Asit K. Chakraborti
DOI:10.1039/c3cc42507j
日期:——
Synergistic dual activation catalysis has been devised for epoxide phenolysis wherein palladium nanoparticles induce electrophilic activation via coordination with the epoxide oxygen followed by nucleophilic activation through anion-pi interaction with the aromatic ring of the phenol, and water (reaction medium) also renders assistance through 'epoxide-phenol' dual activation.
2-tert-Butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2- diazaphosphorine Supported on Polystyrene (PS-BEMP) as an Efficient Recoverable and Reusable Catalyst for the Phenolysis of Epoxides under Solvent-Free Conditions
setting a cyclic continuous-flowreactor operating under solvent-free conditions (SolFC) that allowed us to minimize waste and reduce the E-factor by 95% compared to batch conditions. In addition the representative synthesis of a 2,3-dihydrobenzo[1,4]dioxepin-5-one has been realized. Optimization of this process was achieved by setting up an automated multi-step continuous-flowreactor based on a phenolysis
A conceptually new regioselective and highly syn-stereoselective intermolecular Friedel–Crafts-type O-alkylation of phenols with aryl epoxides by the use of appropriately substituted aryl borates is reported. The carbon–carbon bond formation occurs in neutral and mild conditions without the need for external Lewis acids or transition metal catalysts.