The interplay of secondary Hg⋯S, Hg⋯N and Hg⋯π bonding interactions in supramolecular structures of phenylmercury(ii) dithiocarbamates
作者:Vikram Singh、Abhinav Kumar、Rajendra Prasad、Gunjan Rajput、Michael G. B. Drew、Nanhai Singh
DOI:10.1039/c1ce05678f
日期:——
secondary bonding. In order to elucidate the nature of these secondary bondinginteractions and the electronic absorption spectra of the complexes, abinitio quantum chemical calculations at the MP2 level and density functional theory calculations were carried out for 1–3. Complexes 1 and 2 exhibited photoluminescent properties in the solid state as well as in the solution phase. Studies indicate that
三种新的苯基汞(II)和一种汞(II)二硫代氨基甲酸酯配合物。PhHg S 2 CN(PyCH 2)Bz(1),PhHg S 2 CN(PyCH 2)CH 3(2),PhHg S 2 CN(Bz)CH 3(3)和[Hg(NCS 2(PyCH 2)) Bz)2 ](4)(Py =吡啶; 已合成Bz =苄基),并通过元素分析,IR,电子吸收,1 H和13 C NMR光谱进行了表征。的晶体结构1,2和3在该分子的中心,其中,所述金属原子结合到二硫代氨基甲酸配体的硫原子和芳香环的碳原子呈线性S-汞柱-C的核心。相反,4的晶体结构在分子的Hg(II)中心显示出线性的S–Hg–S核。弱的分子间汞柱⋯N(PY)的相互作用的分子链接到的情况下的直链1,而在形成二聚体的链,2通过分子间的Hg⋯N(Py)和Hg⋯S相互作用。3通过分子间的Hg⋯S二次键合形成常规的面对面二聚结构,而4通过面对面的Hg⋯S二次键
A Palladium-Catalyzed Multicomponent Synthesis of Imidazolinium Salts and Imidazolines from Imines, Acid Chlorides, and Carbon Monoxide
作者:Kraig Worrall、Boran Xu、Sébastien Bontemps、Bruce A. Arndtsen
DOI:10.1021/jo101858d
日期:2011.1.7
imidazolinium carboxylates and imidazolines is described. The palladium catalyst [Pd(CH(R1)N(R2)COR3)Cl]2, or [Pd(allyl)Cl]2, with P(t-Bu)2(2-biphenyl) can mediate the simultaneous coupling of two imines, acid chloride, and carbon monoxide into substituted imidazolinium carboxylates within hours under mild conditions (45 °C, 4 atm of CO). The reaction proceeds in good yield with aryl-, heteroaryl-, and alkyl-substituted
modified method and its application as an efficient promoter was demonstrated for the mechanosynthesis of N-methyl imines using ball milling as a non-conventional process under solvent-free conditions. In this new protocol design, the bis-imidazole acted as a recyclable acid-scavenging agent. This efficient approach to the N-methyl imines displays a combination of the synthetic virtues of a non-conventional
Synthesis of N-methyl imines in the presence of poly(N-vinylpyridine) as a reusable solid base catalyst by a mechanochemical process
作者:Nader Ghaffari Khaligh、Hanna S. Abbo、Salam J. J. Titinchi
DOI:10.1007/s11164-016-2672-y
日期:2017.2
catalytic amounts of poly(4-vinylpyridine) in high yields and rapidly at room temperature by a ball milling process. This new method has some advantages including good yields for relatively unreactive carbonyl compounds and short reaction times as well as being green in terms of avoiding the use of toxic reagents and solvents. The major advantage of this process is that the catalyst can be easily regenerated
4,4′-Trimethylenedipiperidine, a safe and greener alternative for piperidine, catalyzed the synthesis of N-methyl imines
作者:Hayedeh Gorjian、Nader Ghaffari Khaligh
DOI:10.1007/s11164-022-04680-2
日期:2022.5
A practical and facile synthesis of various N-methyl imines, versatile scaffolds, was conducted at 85 °C using 4,4′-trimethylenedipiperidine as a safe and green catalyst. This reagent is a commercially available solid and can be handled easily. It has high thermal stability, low toxicity, and good solubility in green solvents such as water and ethanol. The regenerated catalyst demonstrated stable activity
使用 4,4'-三亚甲基二哌啶作为安全和绿色的催化剂,在 85 °C 下进行了各种N-甲基亚胺、多功能支架的实用且简便的合成。该试剂是一种市售固体,易于处理。热稳定性高、毒性低,在水、乙醇等绿色溶剂中溶解性好。再生后的催化剂在多次循环运行后表现出稳定的活性,其化学结构发生任何变化1H 核磁共振监测。目前工作的新颖之处在于,4,4'-三亚甲基二哌啶由于其广泛的液体温度范围、热稳定性、受体/供体氢键性质和其他独特的特性,可以作为哌啶在较高温度下有机反应中的有希望的替代品。优点。此外,目前的协议避免了在处理过程中产生废物,这是大多数以前报告的程序中的一个缺点。