16373-02-7Relevant academic research and scientific papers
An improved method for synthesis of Jacobsen's catalyst
Cepanec,Mikuldas,Vinkovic
, p. 2913 - 2919 (2001)
The improved synthesis of Jacobsen catalyst 1 was developed. For both enantiomers the obtained overall yield starting from commercially available 4 was 80-85%.
Toolbox of Nonmetallocene Lanthanides: Multifunctional Catalysts in Group-Transfer Polymerization
Adams, Friederike,Machat, Martin R.,Altenbuchner, Peter T.,Ehrmaier, Johannes,P?thig, Alexander,Karsili, Tolga N. V.,Rieger, Bernhard
, p. 9754 - 9764 (2017)
Herein, we present a fundamental study of isostructural 2-methoxyethylamino-bis(phenolate)-lanthanide complexes [(ONOO)RM(X)(THF)] (M = Lu, Y; R = tBu, CMe2Ph, X = CH2TMS, collidine; THF = tetrahydrofuran; TMS =
3,5-Di-(tert-Butyl)-6-fluoro-cycloSal-d4TMP - A Pronucleotide with a Considerably Improved Masking Group
Ducho, Christian,Wendicke, Silke,Goerbig, Ulf,Balzarini, Jan,Meier, Chris
, p. 4786 - 4791 (2003)
A new, considerably improved cycloSal masking group has been developed. This new group combines four desirable properties and has been attached to the anti-HIV drug 2′,3′-dideoxy-2′,3′-didehydrothymidine (d4T, 1) to give 3,5-(di-tert-butyl)-6-fluoro-cycloSal-d4TMP (2i). This phosphate triester has a reasonable chemical half-life, highly selectively released d4TMP, has poor - if any - inhibitory effect on butyrylcholinesterase (BChE), and achieved the TK-bypass. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
M(II) (M=Cu, Ni) Assisted C?S Bond Cleavage and Oxidative Dehydrogenation of Amine on Non-Innocent Salen Type Ligand Platforms by Varying Nitrogen vs. Sulfur Coordination Atoms
Bag, Jayanta,Barman, Souvik,Maiti, Biplab K,Pal, Kuntal
, (2022/02/10)
Herein, we report two newly synthesized salen-type ligands, 2,3-bis((3,5-di-tert-butyl-2-hydroxybenzyl)thio)maleonitrile (H2L1) and 2,3-bis((3,5-di-tert-butyl-2-hydroxybenzyl)amino)malenonitrile (H4L2), bearing different coordination sites (sulfur vs amine) at maleonitrile tethered moiety to investigate metal mediated non-innocence chemistry of these ligands. Upon metallation, ligand H2L1 did not yield simple metal-ligand complex, rather ligand was split into two organic fragments, dithiolene moiety (mnt)2? and phenol moiety via C?S bond cleavage wherein (mnt)2? formed a stable metal complex [M(mnt)2]2?. The C?S bond cleavage was interpreted in terms of strong p(π) … d(π) interaction between metal and dithiolene moiety in H2L1 ligand that invoked the intramolecular rearrangement facilitating C?S bond cleavage. Interestingly, the phenol moiety further transformed to either unprecedented 2,4-di-tert-butyl-6-methylenecyclohexa-2,4-dienone (i. e. spiro compound; 5) or 2,4-di-tert-butyl-6-(hydroxymethyl)phenol (6) depending on the temperature of reaction and type of metal ion used which was further predicted using DFT calculation. On the other hand, combined experimental and DFT studies explained that upon metallation, ligand H4L2 yielded non-cleavage [M(H2L2)] (3 for M=Cu(II) and 4 for M=Ni(II)) complex, which slowly oxidized at ?NH?CH2-(amine) region to ?N=CH? (imine) in H2L2 ligand under aerobic environment via C?H bond activation, yielding [CuII(L3)] (1) (or [NiII(L3)] (2) complex (H2L3=oxidatively dehydrogenated product of H4L2 ligand.
PNO ligand containing planar chiral ferrocene and application thereof
-
Paragraph 0114-0118, (2021/06/21)
The invention discloses a PNO ligand containing planar chiral ferrocene and application thereof. The PNO ligand containing planar chiral ferrocene is a planar chiral ferrocene-containing and phenol-containing PNO ligand as shown in a general formula (I) or (II) which is described in the specification, or a planar chiral ferrocene-containing and aryl-phosphoric-acid-containingPNO ligand containing as shown in a general formula (III) or (IV) which is described in the specification, or a planar chiral ferrocene-containing and carbon-chiral-phenol-containingPNO ligand as shown in a general formula (V) or (VI) which is described in the specification. The invention provides tridentate PNO ligands and processes for their complexation with transition metal salts or transition metal complexes; the introduction of salicylaldehyde and derivatives thereof, which are simple and easy to obtain, enables the ligands to have a bifunctionalization effect, and -OH in a formed catalyst has stronger acidity and is beneficial to combination with N/O in polar double bonds. Therefore, due to the bifunctionalization effect of the catalyst, the interaction between the catalyst and a substrate can be greatly improved, so a reaction can obtain higher catalytic activity and stereoselectivity.
NOVEL CERIUM COMPLEX, AND LIGHT EMITTING MATERIAL
-
Paragraph 0077, (2019/10/01)
PROBLEM TO BE SOLVED: To provide a novel cerium carbene complex suitable for LED phosphors, organic EL emission layer materials, wavelength conversion materials for solar cells, and wavelength conversion materials for agriculture facility, and a method of producing the same. SOLUTION: The present invention provides a cerium complex with trivalent cerium coordinated with a carbene compound; particularly, a cerium complex in which the carbene compound coordinated to trivalent cerium being represented by formula (1). (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 each represent a hydrogen atom, or a C1-20 hydrocarbon group, or a hydrocarbon group containing an oxygen atom or a phosphorus atom, where they may be bound to each other, to form a ring. R11, R12 each represent a hydrogen atom or a C1-20 hydrocarbon group, where they may be bound to each other, to form a ring. x is an integer of 0 to 10). SELECTED DRAWING: None COPYRIGHT: (C)2019,JPOandINPIT
A kind Salen - Fe complex and its preparation method and application
-
Paragraph 0029-0032, (2018/02/22)
The invention relates to a Salen-Fe-like complex, and a preparation method and application thereof. The structure of the complex is disclosed in the specification. The preparation method comprises the following steps: carrying out a two-step process on cy
Electrochemical polymerization of iron(III) polypyridyl complexes through C-C coupling of redox non-innocent phenolato ligands
Unjaroen, Duenpen,Swart, Marcel,Browne, Wesley R.
supporting information, p. 470 - 479 (2017/01/11)
Phenolato moieties impart redox flexibility to metal complexes due their accessible (oxidative) redox chemistry and have been proposed as functional ligand moieties in redox non-innocent ligand based transition metal catalysis. Here, the electro- and spectroelectrochemistry of phenolato based μ-oxodiiron(III) complexes [(L1)Fe(μ-O)Fe(L1)]2+ (1) and [(L2)Fe-(μ-O)Fe(L2)]2+ (2), where L1 = 2-(((di(pyridin-2-yl)methyl)-(pyridin-2-ylmethyl)amino)methyl)phenol and L2 = 3, 5-di-tert-butyl-2-(((di(pyridin-2-yl)methyl)(pyridin-2-ylmethyl)amino)-methyl)phenol, is described. The electrochemical oxidation of 1 in dichloromethane results in aryl C-C coupling of phenoxyl radical ligand moieties to form tetra nuclear complexes, which undergo subsequent oxidation to form iron(III) phenolato based polymers (poly-1). The coupling is blocked by placing tert-butyl groups at para and ortho positions of phenol units (i.e., 2). Poly-1 shows two fully reversible redox processes in monomer free solution. Assignment of species observed during the electrochemical and chemical {(NH4)2[CeIV(NO3)6]} oxidation of 1 in acetonitrile is made by comparison with the UV-vis-NIR absorption and resonance micro-Raman spectroelectrochemistry of poly-1, and by DFT calculations, which confirms that oxidative coupling occurs in acetonitrile also. However, in contrast to that observed in dichloromethane, in acetonitrile, the oligomers formed are degraded in terms of a loss of the Fe(III)-O-Fe(III) bridge by protonation. The oxidative redox behavior of 1 and 2 is, therefore, dominated by the formation and reactivity of Fe(III) bound phenoxyl radicals, which considerably holds implications in regard to the design of phenolato based complexes for oxidation catalysis.
A kind salen-type compound and its preparation method and application
-
Paragraph 0033; 0034; 0036; 0037, (2017/07/04)
The invention discloses a salen-like compound which has a structural formula shown in the specification. The compound has high selectivity and high sensitivity against Zn; and after the compound is added into an acetonitrile solution of a sample to be
Aluminium, gallium and indium complexes supported by a chiral phenolato-prolinolato dianionic ligand
Maudoux, Nicolas,Tan, Eric,Hu, Yuya,Roisnel, Thierry,Dorcet, Vincent,Carpentier, Jean-Fran?ois,Sarazin, Yann
, p. 131 - 143 (2016/12/14)
Congeneric complexes (S)-{?O}MCH2SiMe3 (M=Al, 3; Ga, 5; In, 6) of the triel metals supported by an enantiomerically pure phenolato-alkoxo {?O}2- dianionic tridentate ligand derived from prolinol, along with their chloro derivatives, have been prepared and characterised. The aluminium-alkyl species (S)-{?O}AlMe and 3 form four-coordinate complexes with slightly distorted tetrahedral geometries, whereas the geometry in the Lewis acidic five-coordinate (S)-{?O}GaCl·THF is a distorted trigonal bipyramid. These alkyl complexes do not react cleanly, if at all, with protic sources. The indium(III) compound 6, which is for instance inert towards iPrOH or BnOH even after hours at 70°C, catalyses at 95°C the controlled, immortal ring-opening polymerisation of racemic lactide (up to 1000 equivalents) in the presence of excess BnOH as a chain transfer agent. It affords atactic, monodisperse polylactides with predictable molecular weights.
