Physical Properties of Binary Alcohol + Ionic Liquid Mixtures at Several Temperatures and Atmospheric Pressure

In this study, densities and speeds of sound were measured over the whole composition range, at T = (298.15, 303.15 and 308.15) K and p = 0.1 MPa, for the binary systems of ethanol, or 1-propanol, or 2-propanol and 1-butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide, or 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. The density and speed of sound data were used to calculate the corresponding excess molar volumes and excess molar isentropic compressions, which were fitted with the Redlich–Kister equation. From the obtained results, a discussion was carried out in terms of interactions and structure factors in these binary mixtures.     

Decisive Influence of Phosphorus Ligands on O2 Oxidations of Alkenes in the Presence of the Iron Nitrato/Iron Nitrosyl Couple

Abstract

Fe(NO)₂XL and Fe(NO)X₂L nitrosyl iron complexes, X = Cl, I, and L = HMPA, dppe, PPh₃, activate molecular O₂ to yield nitrato complexes. The phosphorous ligand is decisive for the oxidative power of these nitrates: with HMPA or dppe, oxygen transfer occurs only to phosphines. On going from HMPA to PPh3 the single nitrato complex obtained, Fe(NO)₂X(OPPh₃)₂ selectively epoxidizes cyclohexene, and this is the first example of oxygen transfer from a nitrato ligand to an olefin.     

A Synthesis of Fused Butenoudes

It has been shown that tert-butyldimethylsilylated (Z) 2-carboethoxymethylene cycloalkanols are readily desilylated with concomitant cyclization to give the corresponding butenolides. The (E) isomers are desilylated, but not cyclized under these conditions.