Novel 2H-1,2,3-Triazole sodium complex from N-[2-amino-1,2-dicyanovinyl]alkanamides
摘要:
Diazotization at 0 degrees C of N-[2-amino-1,2-dicyanovinyl]ethanamide 2a or propanamide 2b prepared from diaminomaleonitrile (DAMN) I using aqueous acetic acid and NaNO2 solution furnished sodium complex 3. The X-ray structure of the complex 3 showed that it is a 1:1 mixture of the neutral 2H-triazole heterocycle 4ii and its anion deprotonated at the central (N) atom of the ring, together with a sodium counter ion and two coordinated water molecules. However, when the diazotization reaction was carried out in the presence of aqueous HCl, the product was 5-cyano-2H-[1,2,3]triazole-4-carboxylic acid amide monohydrate 4ii. Diazotization of DAMN 1 using aqueous HCl furnished 1H-1,2,3-triazole-4,5-dicarbonitrile 5, whereas with acetic acid there was no reaction, and hence no route analogous to that leading to complex 3. The structure of both complex 3 and the triazole monohydrate 4ii were solved using X-ray crystallography, and the compounds under study were fully characterized using spectroscopic techniques.
Synthesis of novel 5-amino-6-ethoxy-2-alkylpyrimidine-4-carbonitriles
作者:Amal Al-Azmi、Brian L. Booth、Robin G. Pritchard、Fernanda J. R. P. Proença
DOI:10.1039/b009804n
日期:——
Formation of highly functionalised 5-amino-6-ethoxy-2-alkylpyrimidine-4-carbonitriles has been shown to occur by simply refluxing in ethanol the N-(2-ammonio-1,2-dicyanovinyl)alkylamide chloride or, under acid catalysis conditions, N-(2-amino-1,2-dicyanovinyl)acetamide derivatives, which are readily prepared from diaminomaleodinitrile.
The enhancement of the D–A effect of an asymmetric Schiff base by introducing acetyl groups into diaminomaleonitrile: synthesis, red fluorescence and crystal structure
作者:Ke Wang、Hao Su、Pengfei Wang、Wenjie Wang、Hui Li
DOI:10.1039/c9ra00977a
日期:——
from that of L0. In a THF solution, the maximum fluorescence emission of L1 red-shifted to 90 nm compared with that of L0. Furthermore, in a THF–H2O solution, L1 exhibited aggregation-induced emission (AIE), but L0 exhibited aggregation-caused quenching (ACQ). Uponcoordination with Zn(II), the maximum emission wavelengths in THF for both the ligands were red-shifted to 100 nm and 105 nm, respectively
通过使用前体 Ac-DMN 开发的新策略设计并合成了不对称 salen 型有机配体,Ac-DMN 是掺有乙酰基的二氨基马来腈 (DMN)。本研究主要研究了两类不对称配体Ac-DMN-水杨醛( L 0 )和Ac-DMN-4- N , N-二乙基水杨醛( L 1 )及其Zn( II )配位配合物。有了电子推动取代基, L 1显示出与L 0不同的有趣的光致发光行为。在THF溶液中,与L 0相比, L 1的最大荧光发射红移至90 nm。此外,在THF-H 2 O溶液中, L 1表现出聚集诱导发射(AIE),但L 0表现出聚集引起猝灭(ACQ)。与 Zn( II ) 配位后,两种配体在 THF 中的最大发射波长分别红移至 100 nm 和 105 nm。基于单晶结构分析研究了晶体固态光致发光特性。
295. Studies on hydrogen cyanide. Part X. The tetrapolymer
作者:L. E. Hinkel、G. O. Richards、O. Thomas
DOI:10.1039/jr9370001432
日期:——
Bredereck; Schmoetzer, Justus Liebigs Annalen der Chemie, 1956, vol. 600, p. 95,108
作者:Bredereck、Schmoetzer
DOI:——
日期:——
Bukowska; Prejzner; Szczecinski, Polish Journal of Chemistry, 2004, vol. 78, # 3, p. 417 - 422