Crystal structures and Hirshfeld surface analysis of a series of 4--aryl-perfluoro-pyridines.

Five new crystal structures of perfluoro-pyridine substituted in the 4-position with phen-oxy, 4-bromo-phen-oxy, naphthalen-2-yl-oxy, 6-bromo-naphthalen-2-yl-oxy, and 4,4'-biphen-oxy are reported, 2,3,5,6-tetra-fluoro-4-phen-oxy-pyridine, CHFNO (), 4-(4-bromo-phen-oxy)-2,3,5,6-tetra-fluoro-pyridine, CHBrFNO (), 2,3,5,6-tetra-fluoro-4-[(naphthalen-2-yl)-oxy]pyridine, CHFNO (), 4-[(6-bromo-naphthalen-2-yl)-oxy]-2,3,5,6-tetra-fluoropyridine, CHBrFNO (), and 2,2'-bis-[(perfluoro-pyridin-4-yl)-oxy]-1,1'-biphenyl, CHFNO (). The dihedral angles between the aromatic ring systems in - are 78.74 (8), 56.

Crystal structures of a series of 6-aryl-1,3-diphenyl-fulvenes.

The synthesis and crystal structures of a series of 6-aryl-fuvlenes (fulvene is 5-methyl-idene-cyclo-penta-1,3-diene) with varying methyl-ation patterns on the 6-phenyl substituent are reported, namely 6-(3-methyl-phen-yl)-1,3-di-phenyl-fulvene (CH), 6-(4-methyl-phen-yl)-1,3-di-phenyl-fulvene (CH), 6-mesityl-3-di-phenyl-fulvene (CH) and 6-(2,3,4,5,6-penta-methyl-phen-yl)-1,3-di-phenyl-fulvene (CH). The bond lengths are typical of those observed in related fulvenes. A network of C-H⋯π ring inter-actions consolidates the packing in each structure.

Synthesis and HNO Donating Properties of the Piloty's Acid Analogue Trifluoromethanesulphonylhydroxamic Acid: Evidence for Quantitative Release of HNO at Neutral pH Conditions.

Trifluoromethanesulphonylhydroxamic acid, CF SO NHOH, is shown to release HNO under physiological pH conditions. A two-step synthesis is presented with the first complete characterization of CF SO NHOH. This molecule rapidly decomposes in neutral aqueous solution to cleanly release HNO and CF SO , which was demonstrated using the HNO traps TXPTS and HOCbl, and by F NMR spectroscopy.

Synthesis, Electrochemical Characterization, and Linear Free Energy Relationship of 1,3-Diphenyl-6-alkyl/arylfulvenes.

A series of 1,3-diphenyl-6-alkyl/arylfulvenes was prepared, and the electrochemical properties were investigated. The addition of phenyl groups about the fulvene raised the reduction potential and helped to stabilize the electrochemically generated radical anion. The addition of various functional groups onto the phenyl ring at the 6-position of 1,3,6-triphenylfulvene results in a linear free energy relationship between reduction potential and the Hammett substituent constant, σ.

Stability and ring-shift tautomerization of cyclic anhydrides of benzenehexasulfonic acid.

Upon heating in a dry atmosphere, benzenehexasulfonic acid forms three cyclic anhydrides. Mono- and dianhydride do not hydrolyze readily due their flatter structures compared to the hydrolysis products. The trianhydride appears more to be reactive toward hydrolysis.