Étude cinétique de la synthèse des carbocyanines. I. Aminolyse des sels de ß-ethylthiovinyl-2 cycloammoniums
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1975
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A. Guillaume et al., « Étude cinétique de la synthèse des carbocyanines. I. Aminolyse des sels de ß-ethylthiovinyl-2 cycloammoniums », Bulletins de l'Académie Royale de Belgique, ID : 10.3406/barb.1975.58019
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Summary. — Salts of β-ethylthiovinyl cycloammoniums are generated, as stable intermediates, during the synthesis of carbocyanines starting from orthoesters and quaternary salts with activated methyl groups. In order to set up a reaction scheme of this synthesis, reactivity of these intermediates towards nucleophiles was investigated. Therefore, kinetical parameters of the reaction of 2(β-ethylthiovinyl) 1,3,3-trimethyl indoleninium iodide (trans form) with a series of anilines were determined. The reaction is looked at in acetonitrile at 25 °C. The observed rate constant (κapp.) follows the equation : [formule] pointing out the double part played by the anilines (A).