Synthesis and properties of alkali salts of 2,2,6,6-tetramethyl-1-hydroxypiperidine 1-oxide

Conclusions

• 1. During reaction of 2,2,6,6-tetramethyl-1-oxopiperidinium salts

  

  with alkalies (KOH, NaOH)₃ the metal 2,2,6,6-tetramethylpiperidine 1,1-dioxides

  

  are formed.

• 2. The oxidative properties of aqueous solutions of the salts

  

  salts with respect to alcohols, iodides, H₂O₂, and 2,2,6,6-tetramethyl-1-hydroxypiperidine is attributed to the equilibrium

  

  

  and reaction of

  

  with these compounds.

• 3. A method is found for obtaining isotopically labeled

  

  , based on the reaction of

  

  with HX in H₂ ¹⁸O, and for obtaining 2,2,6,6-tetramethylpiperidin-1-oxyl-¹⁸O, based on reduction of

  

  with hydrogen peroxide in H₂ ¹⁸O.