Ring-closing metathesis reaction-based synthesis of new classes of polyether macrocyclic systems
作者:Naveen、Srinivasarao Arulananda Babu
DOI:10.1016/j.tet.2015.06.070
日期:2015.10
metathesis (RCM) reactions of suitable substrates having terminal olefins, which are assembled from various linkers and hydroxy benzaldehydes and syntheses of a wide range of 16–30 membered, new crown ether-type polyether, aza-polyether, bis aza-polyether macrocycles and dilactone moiety embedded polyethermacrocycles (macrolides) are reported. After the ring-closure reaction, installation of different functional
Four novel dibenzo(perhydrotriazino)-aza-crown ethers, L1, L2, L3 and L4 have been synthesized in good yield by petrenko-kritchenko condensation of bisaldehydes (a-d) with thiourea in the presence of ammonium acetate in the mixture of ethanol and acetic acid. Subsequently, crown ethers L1 and L2 were used as a precursor to synthesize cobalt complexes [Co(L1)2Cl2] and [Co(L2)2Cl2], respectively. The newly synthesized crown ethers have been characterized with the elemental analyses, melting point, IR, 1H NMR, 13C NMR and mass spectral data. The cobalt complexes of crown ethers have been characterized by IR spectra and elemental analyses. Also, electrochemical behaviour of these crown ethers and their cobalt(II) complexes was studied by cyclic voltammetry. The results showed that the electrochemical properties of the synthesized Co(II) complexes revealed the irreversible two electron transfer redox process.
Ultrasound irradiation promoted synthesis of bispyrimidine and bispyrazolines as selective adsorbents for the selective removal of Ag(I) and Pb(II) from aqueous solutions
synthesized bispyrimidine and bispyrazoline were used as new adsorbents for the excellent selective removal of silver and lead ions from aqueous mixed metal ion solution containing Cu(II), Co(II), Ni(II), and Zn(II) by batch technique. Also, the quantitative desorption was achieved for lead and silver ions with 0.5 M of HNO3 and HCl solutions, respectively. Graphical abstract
摘要本文在常规和超声条件下合成了一系列新的含吡唑啉和嘧啶核的五元杂环化合物。第一步,在常规和超声条件下,通过在碱性乙醇中双醛和苯乙酮的Claisen-Schmidt缩合反应制备比沙可康衍生物。在第二步中,通过比沙可康酮与硫脲/苯基肼在碱性介质中的缩合反应合成了双嘧啶和双吡唑啉。超声辅助合成可在室温下较短的反应时间内提供出色的收率。新合成的化合物的结构经IR,1 H NMR,13表征。13 C NMR,质量和元素分析。新型合成的双嘧啶和双吡唑啉用作新型吸附剂,可从包含Cu(II),Co(II),Ni(II)和Zn(II)的混合金属离子水溶液中选择性地优异地去除银和铅离子技术。同样,分别使用0.5 M的HNO 3和HCl溶液实现了铅和银离子的定量解吸。 图形概要
Tabatabaeian; Khorshidi; Dadashi, Oriental Journal of Chemistry, 2011, vol. 27, # 4, p. 1647 - 1652
作者:Tabatabaeian、Khorshidi、Dadashi
DOI:——
日期:——
Catalytic study of the copper-based magnetic nanocatalyst on the aerobic oxidation of alcohols in water
作者:S. Saeid Saei Dehkordi、Jalal Albadi、Abbas Ali Jafari、Heshmat Allah Samimi
DOI:10.1007/s11164-021-04422-w
日期:——
A copper-based magneticnanocatalyst has been prepared by co-precipitation method and characterized by FESEM, EDS, TEM, XRD, XRF, ICP–OES, FTIR, and BET analysis. This new nanocatalyst displays a good activity toward the aerobic oxidation of a wide range of alcohols in water. Moreover, it is recyclable up to five following runs by simple filtration without any significant loss of its catalytic activity