2826-28-0Relevant articles and documents
A colorimetric and fluorescent cyanide chemosensor based on dicyanovinyl derivatives: Utilization of the mechanism of intramolecular charge transfer blocking
Li, Qiao,Cai, Yi,Yao, Hong,Lin, Qi,Zhu, Yuan-Rong,Li, Hui,Zhang, You-Ming,Wei, Tai-Bao
, p. 1047 - 1051 (2015)
Chemosensor (CS1) was designed and synthesized by simple green chemistry procedure. CS1 exhibited both colorimetric and fluorescence turn-off responses for cyanide (CN-) ion in aqueous solution. The probe showed an immediate visible color chang
Malononitrile–derivative chromogenic devices for the detection of cyanide in water
Schramm, Adriana D.S.,Menger, Renata,Machado, Vanderlei G.
, p. 811 - 818 (2016)
Two compounds, 2–(4–hydroxybenzylidene)malononitrile (1a) and 2–[4–(dimethylamino)benzylidene]malononitrile (2), were synthesized with a view to their use as optical devices for anionic detection. Compound 1a was studied as a chromogenic chemosensor using an acid–base strategy. In purely aqueous medium, 1a was used in the detection of CN? with high selectivity. This is possible because the colorless solution of the compound becomes yellow upon addition of the anion, which acts as a base and abstracts the hydrogen from the phenolic moiety of the molecule, generating the corresponding dye (1b). Optical detection and optical quantification limits were determined as 6.17?×?10??7?mol?L??1 and 2.06?×?10??6?mol?L??1, respectively. These values are much lower than the maximum level of the concentration of CN? allowed by the World Health Organization in potable water (1.7?μmol?L??1). Compound 2 was used in a chemodosimeter approach for the highly selective detection of CN? in water with cetyltrimethylammonium bromide above its critical micellar concentration. Solutions of 2 are yellow but become colorless with the addition of the anion. This is because CN? attacks the CH[dbnd]C double bond in the compound and disrupts the electronic conjugation between the electron donating and the electron accepting moieties of the dye. Thus, with the addition of CN? to the medium compound 1a acts as an off–on optical device while dye 2 operates as an on–off chemodosimeter.
Anion controlled structural variation of silver(I) coordination polymers with a new donor-π-acceptor ligand
Das, Sanjib,Sen, Susan,Bharadwaj, Parimal K.
, p. 425 - 428 (2011)
A new ligand with D-π-A symmetry has been synthesized in high yield by Knoevenagel condensation of 4-(dimethylamino)benzaldehyde with malononitrile. The ligand forms coordination polymers with Ag(I) salts at room temperature where the ultimate structure i
Mesoporous titanosilicate Ti-TUD-1 catalyzed Knoevenagel reaction: An efficient green synthesis of trisubstituted electrophilic olefins
Karmakar, Bikash,Chowdhury, Biswajit,Banerji, Julie
, p. 601 - 605 (2010)
A new, efficient and green methodology has been developed for the Knoevenagel condensation using catalytic amount of mesoporous titanosilicate catalyst Ti-TUD-1, under mild conditions at room temperature. The method generates trisubstituted electrophilic olefins in high yields within short reaction time. The mesoporous nature of the catalyst having high surface area helps in binding the substrate to the active site. The advantage of this catalyst is its reusability with almost consistent reactivity thereby making it viable for industrial applications.
A facile and effective synthesis of 4-imino-3-(arylidene)- azetidine-2-thiones via phosphorus pentasulfide
Amiri, Ouafa,Rakib, El Mostapha,Abdelouahid, Medaghri-Alaoui,Faustino, Maria A.F.,Neves, Maria G.P.M.S.,Cavaleiro, José A.S.
, p. 9 - 15 (2015)
A new and an efficient synthesis of 4-imino-3-(arylidene)-azetidine-2-thiones is reported. The reaction of arylidenemalononitriles with phosphorus pentasulfide and ethanol affords the title products in good yields. Elemental analysis, infrared, 1/su
A Simplistic Approach for Preparation of Alkylidenemalononitrile Derivatives: Characterization, In silico Studies, Quantum Chemical Evaluation, Molecular Docking, and In vitro Biological Activity Evaluation
Ahmad, Rumana,Azad, Iqbal,Kamal, Azhar,Khan, Abdul Rahman,Khan, Tahmeena,Nasibullah, Malik
, (2020/11/24)
A new and efficient green grinding-based catalyst free Knoevenagel condensation of aldehydes/ketones and malononitrile for the rapid preparation of twelve malononitrile derivatives (C1-C12) is proposed. Characterization of the derivatives was done by sup
Synthesis of lithium/cesium-Zagronas from zagrosian natural asphalt and study of their activity as novel, green, heterogeneous and homogeneous nanocatalysts in the Claisen–Schmidt and Knoevenagel condensations
Soleiman-Beigi, Mohammad,Ghalavand, Saba,Venovel, Hadis Gholami,Kohzadi, Homa
, p. 3267 - 3279 (2021/06/17)
A novel, heterogeneous and homogeneous basic nanocatalysts were synthesized by grafting of lithium and cesium on zagrosian natural asphalt sulfonate (Li/Cs-Zagronas). The activity of these catalysts was examined in the Claisen–Schmidt and Knoevenagel condensations under mild reaction conditions. Li/Cs-Zagronas were characterized by FT-IR spectroscopy, scanning electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, inductively coupled plasma and thermogravimetric analysis techniques. These nanocatalysts were removed by simple filtration and reused several times without any deterioration of activity.
Effect of supramolecular polymeric aggregation in room temperature ionic liquids (RTILs) on catalytic activity in the synthesis of 4H-chromene derivatives and Knoevenagel condensation
Muhammad, Shoaib,Ali, Firdous Imran,Javed, Muhammad Naveed,Wasim, Agha Arsalan,Bari, Ahmed,Rafique, Faisal,Ilyas, Muhammad Amjad,Riaz, Kashif,Mahmood, Syed Junaid,Ahmed, Amir,Hashmi, Imran Ali
, (2020/10/30)
RTILs exhibit supramolecular self-assembled polymeric aggregation due to noncovalent interactions. The influence of the aggregation behaviour of RTILs on catalytic activity is evident but still poorly understood. The present work focuses on establishing a
Ferrocene-Functionalized Dithiocarbamate Zinc(II) Complexes as Efficient Bifunctional Catalysts for the One-Pot Synthesis of Chromene and Imidazopyrimidine Derivatives via Knoevenagel Condensation Reaction
Anamika,Drew, Michael G. B.,Kumar, Kamlesh,Singh, Nanhai,Yadav, Chote Lal
, p. 6446 - 6462 (2021/05/31)
Four new mononuclear/coordination polymeric (CP) zinc(II) complexes (1-4) of ferrocenyl/pyridyl-functionalized dithiocarbamate ligands, N-ferrocenylmethyl-N-butyl dithiocarbamate (L1), N-ferrocenylmethyl-N-ethylmorpholine dithiocarbamate (L2), N-ferroceny
Introduction of bis-imidazolium dihydrogen phosphate as a new green acidic ionic liquid catalyst in the synthesis of arylidene malononitrile, ethyl (E)-3-(aryl)-2-cyanoacrylate and tetrahydrobenzo[b]pyran derivatives
Rahmatizadeh-Pashaki, Zahra,Daneshvar, Nader,Shirini, Farhad
, p. 2135 - 2149 (2021/02/01)
In this work, [H2-Bisim][H2PO4]2 as a novel bis-imidazole-based acidic ionic liquid has been synthesized and characterized with a variety of techniques including FT-IR, 1H, 13C, 31/su