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Cyclic quaternary ammonium salts Part VIII Imidazol2apyrazinium salts
Reactions of pyridine iVoxides with 36dichloropyridazine
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2-pyridyl absorption acetic acid acetic anhydride acetone acetonitrile acetyl added adduct alcohol alumina Amer amine anhydride aqueous aromatic atom azide benzene benzyl bond bromide Calc carbonyl Chem chloride chloroform chromatographed column compound cooled crystallised crystals cyclisation decomp derivative diluted dimethyl dimethylformamide dissolved distilled doublet dried elution ester ethanol ethyl acetate EtOH evaporated filtered filtrate formation Found fraction gave give heated under reflux hydrazone hydride hydrochloric hydrolysis hydroxide i.r. spectrum isolated isomer ketone lithium lithium aluminium hydride mass spectra MeOH methyl methylene mixed m.p. mmHg mmol mmoles n.m.r. spectra needles nitrogen nucleophilic obtained olefin oxidation peak phenol phosphite potassium precipitate prepared protons pyridine reaction reagent rearrangement reduced pressure requires residue ring room temperature signals silica gel singlet sodium hydroxide solid solution solvent starting material structure sulphuric synthesis Table triethyl phosphite vacuo yellow yield