- Conjugated perimidine corrosion inhibitor and preparation method thereof
-
The invention discloses a conjugated perimidine corrosion inhibitor and a preparation method thereof. The preparation method comprises the following steps: carrying out acylation and cyclization reaction on 1,4,5,8-tetraminonaphthalene and substituted benzoic acid to obtain dialkyl phenyl perimidine; and 2) performing quaternization reaction on the dialkyl phenyl perimidine and hydrobromic acid to prepare a conjugated perimidine corrosion inhibitor. According to the invention, the conjugated perimidine corrosion inhibitor is high in conjugation degree of molecules, can form a large pi bond to be adsorbed on a metal surface in a planar configuration, is strong in adhesive force, greatly improves the corrosion inhibition rate, can be used as a copper and iron corrosion inhibitor, and has a good corrosion inhibition effect.
- -
-
Paragraph 0034-0036
(2021/06/02)
-
- peri-naphthalenediamines: XXXIV. 1,4,5,8-Tetrakis(dimethylamino)naphthalene: Alternative approaches to synthesis
-
New methods were proposed for synthesizing 1,4,5,8-tetrakis(dimethylamino)naphthalene with an overall yield of 4 to 12% to replace the known procedure ensuring an overall yield of 2%. Catalytic hydrogenation was shown to be inapplicable for preparation of polyaminonaphthalenes from nitro compounds having 3 or 4 nitro gruops in the α-positions. Nucleophilic amination of 1,5-dinitronaphthalene in the system NH2OH/NaOH/MeOH yields 1-amino-4-nitronaphthalene. The nitration of 1,5-bis(p-tolylsulfonylamino)-naphthalene leads to formation of 2,6-dinitro rather than 4,8-dinitro derivative, as it was believed formerly. This was confirmed by transformation of the latter into 1,2,5,6-tetrakis(dimethylamino)naphthalene. 3-Nitro, 2,6-dinitro, 2,6-diamino, and 2,4,6,8-tetranitro derivatives of 1,5-bis(dimethylamino)naphthalene, nitro and amino derivatives of 1,4,5-tris(dimethylamino)naphthalene, and 4,5-diamino-1,8-bis(methylamino)naphthalene were synthesized. By treatment with perchloric acid 1,4,5,8-tetrakis(dimethylamino)naphthalene was oxidized to 2,3-dihydroperimidinium salt.
- Sorokin,Ozeryanskii,Pozharskii
-
p. 699 - 708
(2007/10/03)
-