Density functional theory calculations with the B3LYP functional were performed for the title ring-opening reaction to understand the intrinsic activating and directing effects of the N-substituents, as well as the electron donating effect of the para-substituted (Y = Cl, H, Me) phenyl group at the more hindered benzylic C2 atom. The N-tosyl group (i.e., N-Tos) or the N-(2-pyridyl)sulfonyl grou...

Propylene oxide (PO) binding and ring-opening reaction with the bifunctional CO2/epoxide copolymerization catalyst, based on Co(III)-salcy complex including two quaternary ammonium salts n-butyl substituents (N+-chains) were investigated by Density Functional Theory (DFT) calculations compared model systems without N+-chains. The importance of different possible stereoisomers stereoselectivity ...

This review is devoted to relatively new and promising approach the synthesis of novel organic compounds polymer materials, based on “click chemistry” concept. Several types reactions” (cycloaddition, nucleophilic ring opening, non-aldol carbonyl chemistry, addition multiple carbon-carbon bonds) have been described, relevant examples provided. The “thiol-ene” reactions thiol unsaturated functio...

Kinetic resolution of a series fluorinated styrene oxide derivatives was studied using halohydrin dehalogenase. A mutant HheC-W249P catalysed nucleophilic ring-opening with azide and cyanide ions excellent enantioselectivity (E-values up to >200), which gives access various enantiopure ?-substituted alcohols epoxides. It found that the enzyme tolerates substrates in concentrations over 50 mM. H...

2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is a versatile reagent in organic synthesis. Owing to its oxidizing ability and also its relative stability under various reaction conditions cause it to be one of the most used reagents to perform several organic transformations such as oxidation of benzhydrols [1], dehydrogenation [2, 3], deprotection of benzyl ethers [4], anodic oxidation of na...

The depletion of oil reserves and concerns about the environmental impact use incorrect disposal mineral lubricants have been promoting development bio-based lubricants. In this study, biolubricants obtained from fatty acids castor were synthesized by esterification (>wt.%93), epoxidation (>wt.%92), oxirane ring opening reactions using water (>wt.%92) or 2-ethylhexanol (>wt.%94) as ...

Nanoparticles containing fluorine-18 were prepared from block copolymers made by ring opening metathesis polymerization (ROMP). Using the fast initiating ruthenium metathesis catalyst (H2IMes)(pyr)2(Cl)2Ru=CHPh, low polydispersity amphiphilic block copolymers were prepared from a cinnamoyl-containing hydrophobic norbornene monomer and a mesyl-terminated PEG-containing hydrophilic norbornene mon...