16552-45-7Relevant academic research and scientific papers
Synthesis and characterization of novel tetradentate ruthenium complexes of a pyridine-o-phenylenediamine based chelate ligand
Stones, Maryanne K.,Sullivan, Ryan J.,Soldatov, Dmitriy V.,Schlaf, Marcel
, (2020)
The synthesis of the new complexes [cis-Ru(N,N′-bis-(2-pyridylmethyl)-o-phenylenediamine)(Cl)(DMSO)](Cl), [cis-Ru(N,N′-bis-(2-pyridylmethyl)-o-phenylenediamine)(MeCN)2](OTf)2 and [cis-Ru(N,N′-bis-(2-pyridylmethyl)-o-phenylenediamine)
Ionic-liquid supported oxidation reactions in a silicon-based microreactor
Basheer, Chanbasha,Vetrichelvan, Muthalagu,Suresh, Valiyaveettil,Lee, Hian Kee
, p. 957 - 961 (2006)
The combination of microfabrication and reaction engineering techniques has the potential to produce powerful microreactors. In a microreactor, aqueous buffers provide high electroosmatic mobility and no external pumping is required. While numerous reactions have been demonstrated to be highly efficient in microreactors, so far there has been no report on the epoxidation of cyclohexene in a microreactor. This is mainly due to the reduced solubility of cyclohexene in aqueous media. The greater volatility of cyclohexene leading to long reaction times is another reason. To improve the solubility of cyclohexene in the reaction buffer, a water soluble ionic-liquid 1-butyl-3-methylimidazolium tetrafluoroborate was used, also for the first time in microreactor work. In this letter, four different catalysts (i.e., manganese(II) and copper(II) complexes of Schiff and reduced Schiff bases) were synthesized and used for the oxidation reactions considered. The reactions were monitored by gas chromatography/mass spectrometry. The microreactor performance was evaluated by comparing with a conventional (batch scale) reaction. Catalytic activities and yields were found to be relatively high for the copper(II) complexes as compared with the conventional route.
Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1 H-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
Das, Kalicharan,Mondal, Avijit,Pal, Debjyoti,Srivastava, Hemant Kumar,Srimani, Dipankar
supporting information, p. 1815 - 1825 (2019/04/30)
The application of nontoxic, earth-abundant transition metals in place of costly noble metals is a paramount goal in catalysis and is especially interesting if the air- and moisture-stable ligand scaffold is used. Herein, we report the synthesis of amines/imines directly from alcohol and amines via hydrogen autotransfer or acceptorless dehydrogenation catalyzed by well-defined phosphine-free Mn complexes. Both imines and amines can be obtained from the same set of alcohols and amines using the same catalyst, only by tuning the reaction conditions. The amount and nature of the base are found to be a highly important aspect for the observed selectivity. Both the primary and secondary amines have been employed as substrates for the N-alkylation reaction. As a highlight, we showed the chemoselective synthesis of resveratrol derivatives. Furthermore, the Mn-catalyzed dehydrogenative synthesis of structurally important 2,3-dihydro-1H-perimidines has also been demonstrated. Density functional theory calculations were also carried out to model the reaction path and to calculate the reaction profile.
Aluminum compound with double-five-membered chelating ring structure, synthesis method and application thereof (by machine translation)
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Paragraph 0089-0094, (2019/11/21)
The invention provides an aluminum compound with a double-five-element chelate ring structure, a synthesis method and an application thereof, wherein the aluminum I compound has II the structure X of the formula or the formula Y I, N - R and R the R compound is selected from short-chain alkyl radicals or halogens. 1 , R2 , R3 Sum-up table R4 , Independently selected from hydrogen, a short chain alkyl group C3 - C5, a substituted alkyl group, a cycloalkyl group, a hydroxyl group, a halogen group, a phenyl group, an alkyl substituted phenyl group, an oxygen-containing five-membered heterocyclic group, an oxygen-containing R five R-membered heterocyclic group, a cycloheptenol ketone group or a halogen-substituted cycloheptenol ketone group. 1 Sum-up table R2 , R, R3 Sum-up table R4 Rings of the same, different or different from one another; R5 Sum-up table R6 , Independently selected from hydrogen, halogen, short-chain alkyl, cycloalkyl, substituted cycloalkyl or aromatic ring-based group; R and one or more substituents independently selected from hydrogen, halogen, short-chain alkyl, cycloalkyl or aromatic ring5 Sum-up table R6 Rings are the same, different or different from each other. The aluminum compound has a smaller chelating ring structure, the ring tension is larger, and the activity of catalyzing epoxy and anhydride ring opening alternating copolymerization can be improved during application. (by machine translation)
Preparations of Saturated N-P-N Type Secondary Phosphine Oxides and their Applications in Cross-Coupling Reactions
Chang, Yu-Chang,Liang, Ya-Han,Hong, Fung-E
, p. 353 - 367 (2016/05/09)
A series of cyclohexane-1,2-diamine (3a-3d) and benzene-1,2-diamine derivatives (3e-3h) were pre- pared. Followed by hydrolysis, the reaction of 3a-3c with PCl3 successfully led to the formation of cor- responding metastable saturated heteroato
Catalyst stability determines the catalytic activity of non-heme iron catalysts in the oxidation of alkanes
England, Jason,Davies, Catherine R.,Banaru, Maria,White, Andrew J. P.,Britovseka, George J. P.
body text, p. 883 - 897 (2009/05/07)
A series of iron(II) bis(triflate) complexes [Fe(L)(OTf)2] containing linear tetradentate bis(pyridylmethyl)diamine ligands with a range of ligand backbones has been prepared. The backbone of the ligand series has been varied from a two-carbon linkage [ethylene (1), 4,5-dichlorophenylene (2) and cyclohexyl (3)] to a three-carbon [propyl (4)) and a four-carbon linkage (butyl (5)]. The coordination geometries of these complexes have been investigated in the solid state by X-ray crystallography and in solution by 1H and 19F NMR spectroscopy. Due to the labile nature of high-spin iron(II) complexes in solution, dynamic equilibria of complexes with different coordination geometries (cis-α, cis-β and trans) are observed with ligands 2-5. In these cases, the geometry observed in the solid state does not necessarily represent the only or even the major geometry present in solution. The ligand field strength in the various complexes has been investigated by variable temperature magnetic moment measurements and UV-vis spectroscopy. The strongest ligand field is observed with the most rigid ligands 1 and 2, which generate complexes [Fe(L)(OTf)2] with a cis-α coordination geometry and the corresponding complexes [Fe(L)(CH3CN) 2]2+ display spin crossover behaviour. The catalytic properties of the complexes for the oxidation of cyclohexane, using hydrogen peroxide as the oxidant, have been investigated. An increased flexibility in the ligand results in a weaker ligand field, which increases the lability of the complexes. The activity and selectivity of the catalysts appear to be related to the strength of the ligand field and the stability of the catalyst in the oxidising environment.
