Effect of Solvents on Persistent Free Radical Content in the Absence of Reactions was written by Tannous, Joy H.;Tulegenova, Diana;de Klerk, Arno. And the article was included in Energy & Fuels in 2022.SDS of cas: 496-16-2 This article mentions the following:
The impact of a solvent environment on persistent free radical concentrations at ambient conditions was studied by ESR spectrometry. The analyte selected was Canadian oil-sand-derived bitumen due to its high persistent free radical content. The ability of 54 different solvents to produce a homogeneous 5 wt % solution of bitumen was evaluated. The influence of solvents on the free radical content in bitumen was determined exclusively for solvents that were capable of quant. dissolving the bitumen. These were compounds in the classes of alkynes, mono- and bicyclic benzene-derivatives, and heteroatom-containing compounds containing nitrogen, oxygen, sulfur, and chlorine. It was found that a shift in the g-factor of bitumen occurred when the solvent was changed. The shift was attributed to the radical-solvent interaction that is affected by the polarity of the solvent and reflected in the solvent dipole moment property. The change in the free radical concentration was independent of changes in g-factor and was not correlated with any of the following solvent properties: mol. weight, dipole moment, dielec. constant, refractive index, d., and viscosity. There was a relationship between the free radical concentration in bitumen and the ionization potential of sulfur-containing and diarom. hydrocarbon solvents. It was concluded that the bulk liquid properties that affected the electronic environment of the free radical species, resulting in a shift in g-factor, were not related to the bulk liquid properties that affected the dissociation equilibrium and resulted in a change in the free radical concentration In the experiment, the researchers used many compounds, for example, 2,3-Dihydrobenzo[b]furan (cas: 496-16-2SDS of cas: 496-16-2).
2,3-Dihydrobenzo[b]furan (cas: 496-16-2) belongs to benzofurans derivatives. Benzofurans are only weakly aromatic in nature and they are cleaved by many oxidative and reductive conditions. Introduction of benzofurans in organic synthesis, particularly drug synthesis, involves generally the use of their metalated species as nucleophiles in addition reactions or in metal-catalysed cross-coupling reactions.SDS of cas: 496-16-2
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem