Pyridinium cations charge distribution

The preparation, X-ray crystal structure and ab initio calculation of the charge distribution of lV-(2-acetamido-3,4,6-tri-0-acetyl-2-deoxy-p-D-glucopyranosyl)-pyridinium chloride have been reported. The anomeric iV-(2,3,4,6-tetra-0-acetyl-D-glucopyranosyl)-4-dodecylpyridinium bromides were prepared as novel cationic surfactants. The panel of five substituted-pyridinium salts 15 were synthesized from the peracetylated glycosyl chloride of p-D-lV-acetyl-neuraminic acid and used to probe the mechanisms of enzymatic and non-enzymatic hydrolysis of neuraminides. " Detailed analysis of the solvolysis of Af-(2-deoxy-a- and p-D-glucopyranosyl)-4-bromoisoquinolinium tetra-fluoroborate in aqueous alcoholic solvents indicated Sjv2-like transition states. 

The most probable cause of the predominant a dimer formation in concentrated homogeneous solutions of cations 1 and 2 is that this dimer has the least repulsion between the two positively charged pyridinium rings the p, or head-to-head dimer has the most electrostatic repulsion. The difference in the distribution of photoproducts for cations 1 and 2 in concentrated homogeneous solution indicates that the position of the nitrogen in the pyridinium ring has a profound effect on the photochemistry of stilbazole. Results in concentrated aqueous acid... 

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