107910-69-0Relevant articles and documents
Assessing the scope of the introduction of Schiff bases as co-ligands for monometallic and homobimetallic ruthenium ring-opening metathesis polymerisation and ring-closing metathesis initiators
De Clercq, Bob,Verpoort, Francis
, p. 639 - 648 (2002)
A new class of homobimetallic and mono-metallic Schiff base-substituted ruthenium olefin metathesis catalysts has been prepared, characterised and tested in ring-closing metathesis (RCM) and ring-opening metathesis polymerisation (ROMP) reactions. The results obtained point out that the synergy of Schiff base ligands with coordinatively labile ligands leads to bimetallic catalytic systems that combine very high activity with excellent stability. Furthermore, the catalytic activity of these catalysts is very dependent on the steric and electronic environment of the Schiff base. To conclude, a mechanism that explains the obtained data is postulated.
Mechanosynthesis of N-methyl imines using recyclable imidazole-based acid-scavenger: In situ formed ionic liquid as catalyst and dehydrating agent
Khaligh, Nader Ghaffari,Ling, Ong Chiu,Mihankhah, Taraneh,Johan, Mohd Rafie,Ching, Juan Joon
, p. 194 - 199 (2019)
1,1′-(1,4-Butanediyl)bis(imidazole) was prepared by a 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 condensation reaction with ecological benefits and convenience of a facile mechanosynthetic process. The current method has advantages such as reduced waste by avoiding solvent, exclusion of hazardous materials during the reaction, elimination of handling an anhydrous gas in an evacuated container or a solution of methylamine in ethanol, good yields for relatively unreactive benzaldehydes containing electron-donating substituents, short reaction times, and metal- and acid-free conditions. Furthermore, the promoter was easily regenerated and reused several times with no significant loss of activity.
A White Light-Emitting Quantum Dot Complex for Single Particle Level Interaction with Dopamine Leading to Changes in Color and Blinking Profile
Pramanik, Sabyasachi,Bhandari, Satyapriya,Pan, Uday Narayan,Roy, Shilaj,Chattopadhyay, Arun
, (2018)
The interaction of the neurotransmitter dopamine is reported with a single particle white light-emitting (WLE) quantum dot complex (QDC). The QDC is composed of yellow emitting ZnO quantum dots (Qdots) and blue emitting Zn(MSA)2 complex (MSA =
Insight into the steric and electronic effects of ancillary ligands: Synthesis and structure-reactivity relationship of well-defined, air- and moisture-stable (NHC)Pd(sal)Cl complexes (sal = salicylaldimine)
Jin, Zhong,Qiu, Ling-Ling,Li, Yan-Qing,Song, Hai-Bin,Fang, Jian-Xin
scheme or table, p. 6578 - 6586 (2011/02/16)
Synthesis of a series of (NHC)Pd(sal)Cl complexes, 1-5, bearing a salicylaldimine (sal) unit was described. The structure-reactivity relationship, especially the steric and electronic effects of the salicylaldimine ligands on their catalytic activities, was investigated intensively in the Buchwald-Hartwig coupling reaction. Our study demonstrated that the sterically encumbered N-aryl groups in the salicylaldimine unit give rise to an obviously negative effect in the aryl amination reaction. Additionally, incorporating a steric substituent into the ortho-position of the phenoxide oxygen atom does not appear to be beneficial to their catalytic activity. Notably, the electronic nature of N-substituted aryl groups in the salicylaldimine ligands plays a significant role in their catalytic activities. An electron-rich N-aryl group causes an obviously decreasing yield, while an electron-deficient one, such as complex 5b, leads to enhanced reactivity. The aryl amination reaction with complex 5b was also found to be remarkably tolerant to both air and moisture. Under optimized reaction conditions, a range of aryl chlorides and amines could be coupled smoothly under aerobic conditions.
Synthesis, spectra, redox property and catalytic activity of ruthenium(III) Schiff base complexes
Venkatachalam,Maheswaran,Ramesh
, p. 705 - 709 (2007/10/03)
A series of ruthenium(III) complexes of the type [RuX2(EPh 3)2(L)] (where E= P or As, X= Cl or Br; L = bidentate Schiff bases) have been synthesized and characterized on the basis of analytical (elemental analysis, magnetic susceptibility) and spectral methods (FT-IR, UV-vis, EPR). EPR spectra of the powdered samples exhibit three lines with different 'g' values indicating a rhombic distortion in these complexes. Cyclic voltammogram of the complexes displays one reversible oxidation (Ru IV/RuIII) and two reversible reduction peaks (Ru III/RuII, RuII/RuI) with ΔEP=60-80 mV suggesting one electron transfer process. These complexes effectively catalyze the oxidation of primary alcohols to their corresponding aldehydes up to 91.5% in the presence of N-methylmorpholine-N- oxide (NMO) as co-oxidant. The formation of high-valent Run+2=O species as catalytic intermediate is proposed for the catalytic processes.
Photoinitiated processes in molecules of Schiff bases having an NH...N intramolecular hydrogen bond
Ivakhnenko,Makarova,Burlov,Ivakhnenko,Knyazhanskii,Metelitsa,Garnovskii
, p. 1018 - 1022 (2007/10/03)
Study of the absorption and luminescence spectra of Schiff bases derived from o-(p-tolylsulfonyl-amino)benzaldehyde has shown that these systems, like those derived from salicylaldehyde, are characterized by intramolecular proton transfer in the excited a
An alternative synthesis of a potent GPIIb/IIIa receptor antagonist
Hayes, Jerome F.
, p. 865 - 866 (2007/10/03)
A key intermediate to SB-214857 was prepared via an oxidative cyclization of a hydroquinone with a flanking aspartate side chain using Fremy's salt.
Synthesis of New Hetero-Annulated Coumarins: 2,3-Dihydro-4-oxothiapyrano-benzopyran-2-ones, 4-Oxothiapyrano-1-benzopyran-2-ones and 2-Oxo-3,4-dihydrobenzopyrano-4-piperidones
Goorbergh, J. A. M. van den,Steeg, M. van der,Gen, A. van der
, p. 314 - 317 (2007/10/02)
2,3-Dihydro-4-oxothiapyrano-1-benzopyran-2-ones 4 have been prepared by a double conjugate-addition of hydrogen sulfide to the divinyl ketone structure of 3-(1-oxoalkenyl)-1-benzopyran-2-ones 1.Subsequent oxidation of the hetero-annulated coumarins
Mixed Tri- and Bi-dentate Schiff-base Complexes of Technetium(V) and Rhenium(V). The Crystal Structure of N-(2-Oxidophenyl)salicylideneiminato-NOO')oxo(8-quinolinolato-NO)technetium(V)
Mazzi, Ulderico,Refosco, Fiorenzo,Tisato, Francesco,Bandoli, Giuliano,Nicolini, Marino
, p. 1623 - 1628 (2007/10/02)
Six-co-ordinate complexes of technetium(V) and rhenium(V) containing the MO3+ core with tri- and bi-dentate Schiff-base ligands were synthesized and characterized.The complexes with general formula 1)L) 1/sup
