18601-34-8Relevant academic research and scientific papers
Reactions of Chloroiron(III) Schiff Base Complexes with Superoxide Ion in Dimethyl Sulfoxide
Matsushita, Takayuki,Kono, Hiroshi,Nishino, Mitsuru,Shono, Toshiyuki
, p. 2581 - 2587 (1982)
A series of monomeric chloroiron(III) complexes with the quadridentate or quinquedentate Schiff bases such as N,N'-disalicylideneethylenediamine or bisamine react with superoxide ions, O2-, in dimethyl sulfoxide to give the corresponding μ-oxo dimers.The polymeric chloroiron(III) complexes with the polymeric (oligomeric) Schiff bases derived from 5,5'-methylenedisalicylaldehyde and triamines react with O2- in dimethyl sulfoxide to give the oxygenated complexes, probably dioxygen adducts, FeIII-O2-.This is suggested by the absorption spectra and the polarographic measurements.
A Versatile Electrochemical Batch Reactor for Synthetic Organic and Inorganic Transformations and Analytical Electrochemistry
Bourne, Richard A.,Kapur, Nikil,Nicholls, Thomas P.,Schotten, Christiane,Stephen, Hamish R.,Willans, Charlotte E.,Woodward, Madeleine
, p. 1084 - 1089 (2020)
A standardized and versatile electrochemical batch reactor that has wide applicability in both organic and inorganic synthesis and analytical electrochemistry has been developed. A variety of synthetic electrochemical transformations have been performed to showcase the versatility and demonstrate the reactor, including the synthesis of five Cu(I)-NHC complexes, two Au(I)-NHC complexes, and one Fe(II)-NHC complex as well as an Fe(III)-salen complex. The reactor is based on a commercially available vial with an adapted lid, making it inexpensive and highly flexible. It features a fixed interelectrode distance, which is crucial for reproducibility, along with the ability to accommodate a variety of interchangeable electrode materials. The reactor has also been used in conjunction with a parallel plate, allowing rapid screening and optimization of an organic electrochemical transformation. Cyclic voltammetry has been performed within the reactor on a range of imidazolium salt analytes with the use of an external potentiostat. The ability to use this reactor for both analytical and synthetic organic and inorganic chemistry is enabled by a flexible and characterizable design.
Kinetics and mechanism of the reduction of μ-adi-di[N,N′- bis{salicylideneethylenediaminatoiron(III)}] by dithionate ion
Atiga, Simeon,Ukoha, Pius O.,Ujam, Oguejiofo T.,Okpareke, Obinna C.
, p. 189 - 194 (2014)
The kinetics and mechanism of the reduction of the μ-adi-di[N,N′- bis{salicylideneethylenediaminatoiron(III)}] complex, [Fe2adi], by dithionate ion, S2O6 2-, have been investigated in aqueous perchloric acid at 29 C, I = 0.05 mol dm-3 (NaClO 4) and [H+] = 5.0 × 10-3 mol dm -3. Spectrophotometric titrations indicated that one mole of the reductant was oxidized per mole of oxidant. Kinetic profiles indicated first-order rate with respect to [Fe2adi] but zeroth-order dependence on [S2O6 2-]. The rate of reaction increased with increase in [H+], decreased with increased dielectric constant, but was invariant to changes in ionic strength of the medium. Addition of small amounts of AcO- and Mg2+ ions did not catalyse the reaction. A least-squares fit of rate against [H+]2 was linear (r 2 = 0.984) without intercept. The reaction was analysed on the basis of a proton-coupled outer-sphere electron transfer mechanism.
PROCESS FOR PRODUCING ESTER
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Paragraph 0095, (2018/08/02)
PROBLEM TO BE SOLVED: To provide a process for producing ester in which a high quality ester that has excellent color tone, has less contamination of solid matter and can suitably be used in a variety of uses is obtained. SOLUTION: Provided is a process for producing ester, comprising a step of washing an ester obtained by ester exchange reaction between carboxylic acid ester and alcohol in the presence of an iron complex in which a ligand represented by formula (1) or the like is coordinated. (R1 to R7 are each independently a hydrogen atom, an aliphatic group or an aromatic group; here, at least one of R1 and R2, R2 and R3, and R4 and R5 may be bonded to each other to form a ring.). SELECTED DRAWING: None COPYRIGHT: (C)2018,JPO&INPIT
TRANSESTERIFICATION REACTION BY MEANS OF IRON CATALYST
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Paragraph 0114; 0115, (2017/10/10)
Provided is a catalyst for transesterification reactions, which contains an iron salen complex. Also provided is a method for producing an ester compound, which is characterized by carrying out a transesterification reaction between a starting material ester and a starting material alcohol with use of the catalyst.
PRODUCTION METHOD OF ORGANIC COMPOUND
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Paragraph 0022-0024, (2017/09/29)
PROBLEM TO BE SOLVED: To provide a production method of an organic compound crystal, with which a crystal structure of the organic compound crystal can be controlled. SOLUTION: A production method of an organic compound crystal including: a synthesis step to synthesize an organic compound represented by A-B-C (A and C are cyclic structures identical to or different from each other, and B is a connector to connect A and C); a reprecipitation step to reprecipitate the A-B-C in a solvent after the synthesis; and a recrystallization step to recrystallize a precipitate recovered in the reprecipitation step is disclosed in this application. Each of A and C is an organometallic complex comprising heterocycles coordination-bonded to a metal, and A and C are connected to each other via an electron donor (B). SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
μ-Oxo-Dinuclear-Iron(III)-Catalyzed O-Selective Acylation of Aliphatic and Aromatic Amino Alcohols and Transesterification of Tertiary Alcohols
Horikawa, Rikiya,Fujimoto, Chika,Yazaki, Ryo,Ohshima, Takashi
, p. 12278 - 12281 (2016/08/24)
A highly chemoselective and reactive μ-oxo-dinuclear iron(III) salen catalyst for transesterification was developed. The developed iron complex catalyzed acylation of aliphatic amino alcohols with nearly perfect O-selectivity, even when using activated esters, for which chemoselectivity is more difficult to control. In addition, O-selective transesterification of aromatic amino alcohols was achieved for the first time. The high activity of the iron complex enabled the use of sterically congested tertiary alcohols, including unprecedented tert-butanol.
A Straightforward Electrochemical Approach to Imine- and Amine-bisphenolate Metal Complexes with Facile Control Over Metal Oxidation State
Chapman, Michael R.,Henkelis, Susan E.,Kapur, Nikil,Nguyen, Bao N.,Willans, Charlotte E.
, p. 351 - 356 (2016/08/19)
Synthetic methods to prepare organometallic and coordination compounds such as Schiff-base complexes are diverse, with the route chosen being dependent upon many factors such as metal–ligand combination and metal oxidation state. In this work we have shown that electrochemical methodology can be employed to synthesize a variety of metal–salen/salan complexes which comprise diverse metal–ligand combinations and oxidation states. Broad application has been demonstrated through the preparation of 34 complexes under mild and ambient conditions. Unprecedented control over metal oxidation state (MII/III/IVwhere M=Fe, Mn) is presented by simple modification of reaction conditions. Along this route, a general protocol-switch is described which allows access to analytically pure FeII/III–salen complexes. Tuning electrochemical potential, selective metalation of a Mn/Ni alloy is also presented which exclusively delivers MnII/IV–salen complexes in high yield.
Iron catalysed Negishi cross-coupling using simple ethyl-monophosphines
Brown, Caleb A.,Nile, Terence A.,Mahon, Mary F.,Webster, Ruth L.
, p. 12189 - 12195 (2016/01/15)
Monophosphines prepared by iron catalysed hydrophosphination have been used as pro-ligands in iron catalysed Negishi cross-coupling of alkyl bromides and diphenyl zinc reagents. The cross-coupling has been investigated with monophosphines with varying electronic properties and we find the simplest, unsubstituted phosphine to offer the optimum reaction conditions (both in terms of yield of diarylmethane product and cost-effectiveness of the phosphine). In situ catalyst generation from monophosphine and FeCl2 was used in catalysis; however, preparation of a discrete homonuclear iron complex was also achieved and this four-coordinate iron-phosphine complex was isolated and used in catalysis.
Room temperature hydrophosphination using a simple iron salen pre-catalyst
Gallagher,Webster
, p. 12109 - 12111 (2015/01/08)
Phosphines are fundamentally important to the fine chemicals, pharmaceutical and agrochemical industries. Reported is the first example of alkene hydrophosphination using a designed iron pre-catalyst which yields the anti-Markovnikov products in high yield at room temperature. The phosphine products are excellent pro-ligands for Fe-catalyzed Negishi cross-coupling. This journal is
