23652-85-9Relevant academic research and scientific papers
A novel oxidative free radical reaction between 2-hydroxy-1,4-naphthoquinone and β-enamino carbonyl compounds
Chuang, Che-Ping,Wu, Yi-Lung
, p. 1717 - 1719 (2001)
The manganese(III) initiated oxidative free radical reaction between 2-hydroxy-1,4-naphthoquinone and β-enamino carbonyl compound 2 is described. Enamine radical 5 can be generated effectively from the oxidation of enamine 2 by manganese(III) acetate. Spi
Dinuclear cobalt complexes supported by biphenol and binaphthol-derived bis(salicylaldimine) ligands: synthesis, characterization and catalytic application in β-enaminone synthesis from 1,3-dicarbonyl compounds and aliphatic amines
Filkale, Adelew Estifanos,Pathak, Chandni
, p. 15109 - 15121 (2020)
Two new tetradentate ligands, namely, 3,3′-bis[((2,4,6-trimethyl-phenyl)imino)methyl]-[1,1′]-biphenyl-2,2′-diol,H2L1(1), and 3,3′-bis[((2,4,6-trimethylphenyl)imino)methyl]-[1,1′]-binaphthalenyl-2,2′-diol,H2L2(3), based on 2,2′-biphenol and 2,2′-binaphthol frameworks have been synthesized and characterized. Correspondingly, dinuclear cobalt complexes {Co[3,3′-bis-((R)-iminomethyl)-(1,1′)-biphenyl-2,2′-dioxo]}2(2) and {Co[3,3′-bis-((R)-iminomethyl)-(1,1′)-binaphthalenyl-2,2′-dioxo]}2(4) (where R = 2,4,6-Me3C6H2) were synthesizedviareactions of the respective ligands with tetrahydrate cobalt acetate. The complexes were then characterized by elemental analysis, mass spectrometry, IR, UV-vis, magnetic susceptibility and single-crystal X-ray diffraction analysis. The single-crystal X-ray crystallographic study indicates a distorted tetrahedral geometry for each of the metal ions in2and4. The magnetic susceptibility measurements at varying temperatures (5-300 K) showed that the complexes exhibit weak antiferromagnetic (AF) interactions. Both metal complexes2and4successfully catalysed the synthesis of β-enaminones from 1,3-dicarbonyl compounds and aliphatic amines under ambient conditions.
Vibrational assignment, structure and intramolecular hydrogen bond of 4-methylamino-3-penten-2-one
Raissi, Heidar,Moshfeghi, Effat,Farzad, Farzaneh
, p. 1004 - 1015 (2005)
The molecular structure, intramolecular hydrogen and vibrational frequencies of 4-methylamino-3-penten-2-one were investigated by a series of density functional theoretical (DFT) calculations and ab initio calculation at the post-Hartree-Fock (MP2) level. Fourier transform infrared and Fourier transform Raman spectra of this compound and its deuterated analogue were clearly assigned. The calculated geometrical parameters show a strong intramolecular hydrogen bond with a N...O distance of 2.622-2.670 A. This bond length is about 0.02 A shorter than that in its parent, 4-amino-3- penten-2-one which is in agreement with spectroscopic results. Furthermore, the conformations of methyl groups with respect to the plane of the molecule and with respect to each other were investigated.
CATALYST COMPOSITION FOR POLYMERIZATION OF OLEFINS
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, (2015/11/10)
The present invention relates to a catalyst composition comprising the compound represented by the Fischer projection of formula (I) as an internal electron donor, (I) wherein: R1, R2, R3, R4, R5 and R6 are the same or different and are independently selected from a group consisting of hydrogen, straight, branched and cyclic alkyl and aromatic substituted and unsubstituted hydrocarbyl having 1 to 20 carbon atoms; R7 is selected from a group consisting of straight, branched and cyclic alkyl and aromatic substituted and unsubstituted hydrocarbyl having 1 to 20 carbon atoms; and R8 is selected from a group consisting of aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms; N is nitrogen atom; O is oxygen atom; and C is carbon atom. The present invention also relates to a process for preparing said polymerization catalyst composition and to a polymerization catalyst system comprising said catalyst composition, a cocatalyst and optionally an external electron donor. Furthermore, the present invention relates to a polyolefin obtainable by the process according to the present invention and to the use of the compound of formula (I) as in internal electron donor in catalysts for polymerization of olefins.
CATALYST COMPOSITION FOR POLYMERIZATION OF OLEFINS
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, (2015/12/27)
A catalyst composition comprising a monoester, the compound represented by formula (I) as an internal electron donor, and optionally an additional internal electron donor selected from a group consisting of diesters and diethers, wherein: R1, R2, R3, R4, R5 and R6 are hydrogen, straight, branched and cyclic alkyl having at most 20 carbon atoms and aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms, R7 is a straight, branched and cyclic alkyl having at most 20 carbon atoms and aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms, and R8 is an aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms. Also described is a process for preparing the polymerization catalyst composition, a polymerization catalyst system comprising the catalyst composition, a co-catalyst and optionally an external electron donor; and use of the catalyst system for polymerization of olefins.
Photochromism of rotation-hindered furylfulgides influenced by steric modifications
Struebe, Frank,Siewertsen, Ron,Soennichsen, Frank D.,Renth, Falk,Temps, Friedrich,Mattay, Jochen
experimental part, p. 1947 - 1955 (2011/04/27)
The syntheses of a bicyclic furylfulgide 14 and a (benzofuryl)fulgide 15 with increased steric constraints are described. Their photochromic behaviors were analyzed by means of UV/Vis spectroscopic measurements, X-ray crystallography, and NMR experiments, and the results were compared to those of the furyl(methyl)fulgide 12 and the furyl(isopropyl)fulgide 13. Compounds 13E and 14E exhibit large quantum yields of 0.57 and 0.53 for the coloration reaction (E) → (C) compared with 12E and 15E (0.23 and 0.17). After irradiation with 350 nm light, 13E and 14E are transformed into the closed (C) forms almost quantitatively, whereas 12E and 15E result in a photostationary state with mixtures of the (E), (Z), and (C) forms. The crystal structures obtained for 13E, 14E, and 15E show that the fulgides adopt cyclizable helical (P)-Eα conformations with no significant differences in atomic distances in the hexatriene unit. 2D- and temperature-dependent NMR experiments showed that the enantio- and diastereotopomerization processes were suppressed in a fulgide for the first time. Compound 14E populates only the E α conformational state. In contrast, 13E and 15E both exist in the cyclizable Eα and the non-cyclizable Eβ conformations in solution. Due to the annulated benzene ring, 15E exhibits a higher thermodynamic barrier than 13E, so the "belly roll" process was reduced for 15, but the (E) → (Z) isomerization could not be suppressed. The structural modification of 14 successfully suppressed the (E) → (Z) isomerization as well as the belly roll process. The way in which the isomerization reaction is suppressed by steric hindrance could not be fully elucidated by using these methods. Copyright
Functionalized fulgides and fluorophore-photoswitch conjugates
Struebe, Frank,Rath, Susann,Mattay, Jochen
experimental part, p. 4645 - 4653 (2011/10/03)
Various fulgides based on benzofuryl and indolyl core units with versatile functionalities were synthesized. Substitution at the phenylic site shows only small effects on the photochromic properties compared to the parent compounds 30 and 31. Fulgide-dye
1,2-Acyl group migration in the oxidative free radical reaction of 2-substituted-1,4-quinones
Tsai,Chuang, Che-Ping
, p. 5098 - 5102 (2008/09/21)
Oxidative free radical reactions of 2-substituted-1,4-quinone derivatives are described. Electrophilic carbon-centered radical produced by the manganese(III) acetate oxidation of α-chloro-β-ketoester undergoes efficient addition to the C-C double bond of
Efficient synthesis of highly substituted pyrrolin-4-ones via PIFA-mediated cyclization reactions of enaminones
Huang, Jie,Liang, Yongjiu,Pan, Wei,Yang, Yang,Dong, Dewen
, p. 5345 - 5348 (2008/09/17)
A convenient and efficient synthesis of highly substituted pyrrolin-4-ones is developed via the PIFA-mediated cyclization reactions of readily available enaminones, and a mechanism involving sequential cleavage of N - C bond, formation of new N - C bond, intramolecular addition reaction, and benzilic acid type rearrangement is proposed.
Iodine-catalyzed conversion of β-dicarbonyl compounds into β-enaminones within a minute under solvent-free conditions
Gogoi, Siddhartha,Bhuyan, Ranjana,Barua, Nabin C.
, p. 2811 - 2818 (2007/10/03)
Synthesis of β-enaminones from β-dicarbonyl compounds has been achieved in high yields within a minute using primary and aromatic amines and catalytic amounts of iodine under solvent-free conditions at room temperature. Copyright Taylor & Francis, Inc.
