METHOD OF PRODUCING PIPERAZINOPHENOLS Russian patent published in 2012 - IPC C07D241/04 C07D403/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing piperazinophenols, involving reaction of piperazine, N-(β-aminoethyl)piperazine, N-(β-benzylaminoethyl)piperazine or N,N¹-bis-(piperazinoethyl)ethylenediamine with a Mannich base in an aqueous medium at temperature 90-110°C in molar ratio of piperazine, N-(β-aminoethyl)piperazine, N-(β-benzylaminoethyl)piperzine:Mannich base equal to 1:0,8-2, N,N¹-bis-(piperazinoethyl)ethylenediamine:Mannich base equal to 1:2 or 1:4 until release of dimethylamine stops; as well as aminomethylation of piperazine or N-(β-aminoethyl) piperazine with diphenylol propane (DPP) in the presence of formaldehyde (FA) in an aqueous medium with molar ratio piperazine: FA: DPP equal to 1:1:1 or 1:2:2 at temperature 50-90°C for 4-10 hours. Reactants react in the presence of a surfactant in amount of 2-6% of the weight of the starting piperazine, and the surfactant used is neonol, OP-7, OP-10.

EFFECT: ensuring fire safety of the process, high output of the end product which can be used as antioxidant phenol stabilisers.

1 cl, 13 ex