Abstract
The reaction between aryl diazonium salts and aryl sulphonyl hydrazones in ethanol-pyridine is a simple, metal-free route to the synthesis of 2,5-diaryltetrazoles. However, it is difficult to use for polyaromatic precursors that are poorly soluble in such a polar medium. We show here that the choice of another reaction solvent such as acetone-pyridine can, in many cases, lead to perfect control of the reaction and to the spontaneous precipitation of the targeted tetrazoles.
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