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Geometries and interaction energies of benzene complexes with pyridine, pyridinium, N-methylpyridinium were studied by ab initio molecular orbital calculations. Estimated CCSD(T) interaction energies of the complexes at the basis set limit were -3.04, -14.77, and -9.36 kcal/mol, respectively. The interactions in the pyridinium and N-methylpyridinium(More)
Cation-π interactions have been widely exploited and utilised in the structural biology arena, their fundamental importance in supramolecular chemistry and the pivotal role they play in host guest chemistry has rapidly expanded. In terms of organic synthesis π-π, CH-π and cation-π interactions are often invoked providing hypotheses for observed(More)
Exposure of 4-azachalcones to HCl gas produced the corresponding HCl salts with a head-to-tail stacked alignment, irradiation of which produced the corresponding syn-HT dimers with high regio- and stereoselectivities, thus showing the effectiveness of the cascade process in crystals.
BACKGROUND Changes in saccharide, amino acid and S-methylmethionine (SMM) concentrations and enzyme activities during the malting of barley grown with different nitrogen (N) and sulfur (S) supplementation were investigated in order to clarify their relationship with N and S fertiliser levels. RESULTS Concentrations of N and S in barley grain were(More)
Regio- and stereoselective [4 + 4] photodimerization reactions of 1- and 2-azaanthracenes were performed in both methanol solution and solid phases to give anti-HT dimers in high yields. In these reactions, intermolecular cation-π interactions between the pyridinium cation and the benzene ring play a key role in preorientation prior to the photodimerization(More)
We described a new approach for the solid-state photodimerization of alkenes in which the cation-pi interaction between a pyridinium and an aromatic ring serves as a powerful tool to control the alignment of alkenes in a crystal. The irradiation of 4-azachalcone (1a) gave the synHT dimer 2a in 49% yield, whereas the photolysis of 4'-methoxy-4-azachalcone(More)
The tribological properties of the molecularly thin films of asymmetric ether (1,3-dimethylbutyl octyl ether, AE) and fluorinated asymmetric ether (1H,1H,2H,2H-perfluorooctyl-1,3-dimethylbutyl ether, FAE) were investigated. Friction forces and dynamic thicknesses (thicknesses during sliding) were simultaneously measured using the surface forces apparatus,(More)