Method for producing the pentazolate anion using a hypervalent iodine oxidant

A method for producing the pentazolate anion, comprising:

• oxidation of a phenolic arylpentazole by a hypervalent iodine oxidant in the presence of a base, said hypervalent iodine oxidant being of general formula A-B, wherein group A designates a benzene ring, and group B is a structure comprising a hypervalent iodine atom having one of the two formulas B1 or B2 below:
• with *— designating, in the formulas B1 and B2, the bond of the hypervalent iodine atom to the benzene ring A,
• in formula B2, R1 and R2 being identical or different and chosen independently of one another from:
• **—OCOR, **—OR, where R designates a linear or branched, alkyl chain comprising between 1 and 4 carbon atoms, or R1 being **—OH and R2 being **—OTs with Ts designating a tosyl group, where **— designates the bond of the oxygen atom to the hypervalent iodine, the phenolic arylpentazole having the following chemical structure:
• R3 and R4 being identical or different and chosen independently of one another from:
• the, linear or branched, alkyl chains comprising between 1 and 4 carbon atoms, not substituted or substituted by a C1 or C2 alkoxy group or by a dialkylamine.