Resource- and Energy-Saving Method for Obtaining Hydrogen Fluoride and Hydrite Fluoride

An ecologically and economically effective technical solution has been developed for the production of hydrogen fluoride and fluorine hydrite by using fluorosulfonic acid in the decomposition technology of fluorspar. The stages of the technology of obtaining hydrogen fluoride and fluorine hydrite are shown: obtaining fluorosulfonic acid itself, decomposition of calcium fluoride with fluorosulfonic acid and hydrolysis of calcium fluorosulfonate with water vapor to form fluorosulfonic acid, recycled, hydrogen fluoride and fluorine hydrite. Experimental data have shown the promise of this technology.

Selectivity Control in Terpene Rearrangements: A Biomimetic Synthesis of the Halimanic Bicyclic Core

The bicyclic core of the halimanic framework is synthesized in optically active form by an acid-induced rearrangement of a homo­drimanic epoxide. The substrate can follow two different pathways under acidic treatment. Using fluorosulfonic acid as a promoter at low temperature favors ring contraction to a perhydrindanic structure. In contrast, milder acids at higher temperatures bring about predominantly an angular methyl migration and formation of the halimanic bicyclic system. In particular, an acidic pillared clay selectively promoted this transformation.

Crystal Structure and NMR Study of Tetrakis(acetonitrile)silver(I) Fluorosulfonate [Ag(CH3CN)4]+[SO3F]–

The title compound [Ag(CH3CN)4]+[SO3F]- crystallizes in the orthorhombic space group Pna21, a = 24:383(24), b = 8:632(11), c = 20:755(17) Å, V = 4368(6) Å3, Z = 12, with three independent formula units in the unit cell. A comparison with the isostructural compound [Ag(CH3CN)4]+ [ClO4]- is given. The salt has also been characterized by solution 1H and 19F NMR spectroscopy and the data compared to that of fluorosulfonic acid

On the Peculiarities of the Ring Contraction Reactions of Homodrimanes via Acid Mediated Epoxide Rearrangement

A selective rearrangement of a epoxy-homodrimanic substrate is described. Using fluorosulfonic acid at low temperature leads by ring contraction to a perhydrindanic structure. On the contrary, using boron trifluoride-diethyl ether at r.t. selectively brings about angular methyl migration.