1,4-Dihydropyridine charge control agents for electrostatographic toners and developers
申请人:EASTMAN KODAK COMPANY
公开号:EP1109070A2
公开(公告)日:2001-06-20
A charge control agent is disclosed selected from the group consisting of 1,4-dihydropyridines having the following general structure:
where R1, R2, R3, R4, R5, X, and Z are defined in the specification. These compounds are useful in electrostatographic toners and developers.
本发明公开了一种电荷控制剂,它选自具有以下一般结构的 1,4-二氢吡啶类:
其中 R1、R2、R3、R4、R5、X 和 Z 的定义见说明书。这些化合物适用于电致发光调色剂和显影剂。
Zn-VCO3 hydrotalcite: A highly efficient and reusable heterogeneous catalyst for the Hantzsch dihydropyridine reaction
作者:Ramakanth Pagadala、Suresh Maddila、Venkata D.B.C. Dasireddy、Sreekantha B. Jonnalagadda
DOI:10.1016/j.catcom.2013.11.012
日期:2014.2
The Zn-VCO3 hydrotalcite was found to be an excellent solid catalyst for the one-pot synthesis of triphenylpyridine-3,5-dicarboxamide via Hantzsch reaction of acetoacetanilide, ammonium hydroxide and various aromatic aldehydes. The combinatorial syntheses were achieved for the first time using hydrotalcite as a heterogeneous catalyst. The catalyst was active for the Hantzsch reaction in water at 60 degrees C. The products were isolated in good yields (85-93%) with short reaction times (2-3 h). The resulting substituted dihydropyridines were characterized and confirmed by H-1 and C-13 NMR, FTIR, and HRMS spectral data and the solid catalyst was characterized by XRD, BET, SEM and TEM. The newly synthesized heterogeneous solid catalyst offers simple means for recovery and the isolated catalyst was reused for five rounds for the synthesis of compound 4a, without significant loss of catalytic activity. For all the other reactions carried out with the recycled catalyst, results were similar to with the fresh catalyst. (C) 2013 Elsevier B.V. All rights reserved.
2-Hydroxyethylammonium acetate: an efficient and reusable homogeneous catalyst for the synthesis of Hantzsch 1,4-dihydropyridines
作者:Li-Qin Kang、Zhi-Jun Cao、Ze-Jun Lei
DOI:10.1007/s00706-015-1587-4
日期:2016.6
2-Hydroxyethylammonium acetate ionic liquid was found to be an excellent catalyst for the one-pot synthesis of 1,4-dihydropyridine derivatives via Hantzsch reaction of ethyl acetoacetate or acetoacetanilide, ammonium acetate, and various aromatic aldehydes. The combinatorial syntheses were achieved for the first time using 2-hydroxyethylammonium acetate ionic liquid as a homogeneous catalyst. The catalyst was active for the Hantzsch reaction in alcohol at reflux. The products were isolated in good yields (78-93 %). The resulting substituted dihydropyridines were characterized and confirmed by(1)H NMR spectral data. The catalyst offers simple means for recovery and the isolated catalyst was reused for three rounds for the synthesis without significant loss of catalytic activity. For all the other reactions carried out with the recycled catalyst, results were similar to that with the fresh catalyst.
Synthesis of N 3,N 5,4-triaryl-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxamides