each synthesized compound in these two solvents. By changing the solvent from CHCl3 to DMSO, the E/Z ratios decreased. The results demonstrated that the ΔG° values for the formation of Zisomers were more negative than those of the Eisomers in DMSO. This is why Zisomers are more stable than Eisomers in DMSO. The results of density functional theory (DFT) calculations at B3LYP/6–311++G (d,p) level
报道了一种通过芳基重氮硅硫酸盐纳米复合材料与丙二腈、乙酰乙酸乙酯和二甲酮反应来合成一系列芳基腙的快速有效方法。所有反应均在室温下在水中进行,相应的产物以 77-87% 的产率获得。使用乙酰乙酸乙酯合成的芳基腙中存在两种分子内氢键,使这些化合物能够通过围绕腙C N 键旋转而转换,从而导致它们的E和Z构型之间的可逆异构化。这种转换可以通过改变溶剂的极性来控制。在 CHCl 3 中研究了每种合成化合物的E/Z比和二甲基亚砜。E/Z的比率是使用1 H NMR 数据在 CDCl 3和 DMSO- d 6中计算的,并用于计算每种合成化合物在这两种溶剂中的EZ异构化的ΔG ° 。通过将溶剂从 CHCl 3改为 DMSO,E/Z比降低。结果表明,在 DMSO 中形成Z异构体的 Δ G ° 值比E异构体的更负。这就是为什么Z异构体比E更稳定DMSO 中的异构体。B3LYP/6–311++G (d,p) 理论水平的密度泛函理论
Synthesis and structural characterization of oxovanadium(IV) complexes of dimedone derivatives
作者:Gamil A.A. Al‐Hazmi、Khlood S. Abou‐Melha、Ismail Althagafi、NashwaM. El‐Metwaly、Fathy Shaaban、Mansour S. Abdul Galil、Ashraf A. El‐Bindary
DOI:10.1002/aoc.5672
日期:2020.8
synthesized new oxovanadium (IV) complexes with dimedone derivatives and their structure were confirmed by elemental analyses, spectroscopic techniques (FT‐IR, UV–visible, EPR) and thermal analysis. The reaction of [VO (acac)2] with the azo dimedone ligands (HLn) produced mononuclear oxovanadium (IV) complexes with formula [VO (Ln)2]H2O. Results of the molar conductance proved that VO2+ complexes are non‐electrolytes
我们已经成功地合成了带有二甲酮衍生物的新型氧钒(IV)配合物,其结构已通过元素分析,光谱技术(FT-IR,UV-可见,EPR)和热分析得到了证实。[VO(ACAC)的反应2 ]与偶氮双甲酮配体(HL Ñ单核氧钒(IV)化合物与式配合物[VO(L生产)Ñ)2 1 H 2的摩尔电导的O.结果证明,VO 2+络合物是非电解质和落入范围14-16Ω- 1厘米2摩尔-1。VO(IV)配合物的配位几何形状为方形锥体,其中钒(IV)离子由羰基(C = O)基团的氧原子和去质子化moiety部分(–NH–)的氮原子配位,而第五位是羰基。而且,已经估计了优化的结构,键角,键长以及所计算的配合物的量子化学参数。使用电子吸收滴定和粘度测量研究复合物的DNA结合活性。获得的结果表明,复合物与CT‐DNA发生凹槽结合,配体部分插入DNA的碱基堆栈之间,结合常数为2.07–5.51 x 10 5 M -1范围。据报道
Visible light mediated organocatalytic dehydrogenative aza-coupling of 1,3-diones using aryldiazonium salts
An efficient protocol for diazenylation of 1,3-diones under photoredox conditions is presented herein. C–N bond forming Csp3–H functionalization of cyclic and alkyl diones by unstable aryl diazenyl radicals is achieved through reaction with aryldiazonium tetrafluoroborates by organocatalysts under visible light irradiation. The reaction has wide substrate scope, gives excellent yields, and is also
本文提出了在光氧化还原条件下 1,3-二酮二氮烯基化的有效方案。在有机催化剂的可见光照射下,不稳定的芳基二氮烯基自由基与芳基重氮四氟硼酸盐反应,实现了环二酮和烷基二酮的 C-N 键形成 C sp 3 -H 官能化。该反应底物范围广,产率优异,并且在水作为绿色溶剂中也很有效。该方法提供了一种容易获得芳基二氮烯基衍生物的方法,芳基二氮烯基衍生物是合成氮杂杂环以及潜在药效团的有用关键起始材料。
A Microwave Assisted Diazo Coupling Reaction: The Synthesis of Alkylazines and Thienopyridazines
作者:Saleh Al-Mousawi、Abdel-Zaher Elassar、Morsy Ahmed El-Apasery
DOI:10.1080/10426500500536457
日期:2006.8.1
Heating diazoaminobenzene with active methylene compounds 1-3 in microwave oven in acetic acid, in the presence of hydrochloric acid, afforded the corresponding arylhydrazones 5-7. These reaction products were condensed with ethyl cyanoacetate in a domestic microwave oven after 1-2 minutes heating to yield the pyridazinones 8-12. Compounds 8c and 12 reacted with sulfur in basic DMF solution, in microwave oven using MORE technology to yield the thienopyridazinone 14 and 16 respectively. While 17 was produced when 8b was treated like wise with sulfur and DMF in the presence of piperidine. Compounds 16 coupled with aromatic diazonium salts to yield arylazo derivatives 21a-c.
Lifschitz, Chemische Berichte, 1914, vol. 47, p. 1405