42592-31-4Relevant academic research and scientific papers
Two modifications of a five-coordinate silicon complex
Boehme, Uwe,Foehn, Ines C.
, p. o613-o616 (2007)
TBPY-5-34-(Butane-1,4-di-yl)(2-{[1-(2-oxidophen-yl)ethyl-idene-O]amino-N} ethano-lato-O)silicon, C14H19NO2Si, crystallizes in two modifications. The monoclinic form, (IIm), was obtained by crystallization over a period of 2 d at room temperature; the ortho-rhom-bic form, (IIo), crystallized overnight at 248 K. The main difference between the two mol-ecular structures involves the angles in the equatorial plane of the trigonal bipyramid around silicon. Form (IIm) has an O - Si - O angle of ca 121° and O - Si - C angles of ca 121 and 116°. In form (IIo), the corresponding angles are 123, 124 and 111°. There are also significant differences in the packing: (IIm) shows π stacking, whereas (IIo) does not. International Union of Crystallography 2007.
Hydrogenation of alkenes and alkynes catalysed by N?O (imino)phenol palladium(II) complexes: Structural, kinetics and chemoselectivity studies
Tshabalala, Thandeka A.,Ojwach, Stephen O.
, p. 35 - 42 (2018/08/21)
Reactions of 2-(2-methoxyethylimino)ethyl)phenol (HL1), 2-(2-hydroxyethylimino)ethyl)phenol (HL2), 2-(2-aminoethylimino)ethyl)phenol (HL3) and 2-(2-hydroxyethylimino)methyl)phenol (HL4) with [PdCl2(COD)] afforded the neutral palladium complexes [PdCl2(HL1)] (1), [PdCl2(HL2)] (2), [PdCl2(HL3)] (3), [PdCl2(HL4)] (4) respectively. Treatment of complex 1 with PPh3 gave the cationic complex [Pd(HL1)ClPPh3]+ (5), while reactions of 4 with Pd(OAc)2, in the presence of PPh3 and p-TsOH produced the corresponding palladium complex, [Pd(L1) (OTs) (PPh3)] (6). The molecular structure of 4a (derivative of 4) contained two bidentate anionic ligands (L4). Complexes 1–6 formed active catalysts in hydrogenation of alkenes and alkynes, in which the catalytic activities were largely dependent on the pendant donor atom of the ligand motif. Isomerization reactions were dominant in terminal alkenes hydrogenation reactions, while hydrogenation of alkynes to alkanes occurred in two steps via alkene intermediates. Kinetics data were consistent with homogeneous active species. Density functional theory studies supported the hemi-labile nature of the ligands, and offered insights into the catalytic activity trends observed.
Structural and ethylene oligomerization studies of chelated N?O (imino/amino)phenol nickel(II) complexes
Ngcobo, Makhosonke,Ojwach, Stephen O.
, p. 33 - 39 (2017/06/06)
Condensation reactions of 2-aminoethanol with the appropriate aldehyde gave ligands 2-[1-[(2-hydroxyethyl)imino]ethyl]phenol (L1) and 2-[(2-hydroxyethyl)imino] methyl]phenol (L2) respectively. Subsequent reductions of L1 and L2 with NaBH4 affor
Synthesis, structures, and antimicrobial studies of cobalt(III) complexes with tridentate schiff bases
Fang, Wen-Yan,Xu, Mai,Zhu, Chuan-Gao,Wei, Yi-Jun,Wang, Feng-Wu
experimental part, p. 109 - 114 (2012/04/23)
Two new cobalt(III) complexes, [Co2(L1) 2(AEN)(N3)] (1) and [Co(L2)(PEA)(N 3)] (2) (L1 = 2-[1-(2-hydroxyethylimino) ethyl]phenolate, L2 = 2-[1-(2-phenylaminoethylimino
One-dimensional chain copper(II) complex: Synthesis, X-ray crystal structure and catalytic activity in the epoxidation of styrene
Saha, Debraj,Maity, Tanmoy,Dey, Tirthankar,Koner, Subratanath
experimental part, p. 55 - 61 (2012/05/19)
Two new copper(II) complexes, [Cu(HL1)(NO3)] (1) (H2L1 = 1-(N-ortho-hydroxyacetophenimine)-ethane-2-ol) and {[Mg(H2O)6][Cu(pydca)2]·2H 2O}n (2) (H2pydca = 2,5-pyridine dicarboxylic acid) have been synthesized and characterized. X-ray crystal structure analysis reveals that the geometry of complex 1 is square planar, where copper(II) centers are linked through a weak coordination by the nitrate O atoms occupying two axial positions, resulting a helical chain structure. Complex 1 crystallizes in the chiral space group P21. There is no chiral center in the Schiff-base ligand of 1, its helical structure develops due to the formation of a NO3- bridged chain through an asymmetric arrangement. Complex 2 is a 1D chain in which the copper(II) ions are connected by bridging carboxylato ligands. The [Mg(H2O)6]2+ moiety occupies the inter-chain space. Epoxidation reactions of styrene and substituted styrenes are homogeneously catalyzed by complexes 1 and 2 with H 2O2 as the oxidant.
Synthesis, characterization and X-ray studies of new six-seven membered rings [4.5.0] heterobicyclic system of monomeric boronates
Rivera, José María,Méndez, Enrique,Colorado-Peralta, Raúl,Rincón, Susana,Farfán, Norberto,Santillán, Rosa
body text, p. 26 - 32 (2012/07/16)
Different tridentate ligands derived from ethanolamines and 2-hydroxyacetophenone, 2-hydroxybenzophenone and salicylaldehyde were reacted with two equivalents of phenylboronic acid to obtain compounds 6a-6f which are [4.5.0] heterobicyclic systems with a
X-Ray crystallographic and spectroscopic properties of eight Schiff bases as evidence of the proton transfer reaction. Role of the intermolecular hydrogen bond
Dominguez, Oscar,Rodriguez-Molina, Braulio,Rodriguez, Mario,Ariza, Armando,Farfan, Norberto,Santillan, Rosa
supporting information; experimental part, p. 156 - 164 (2011/04/14)
A spectroscopic study of several ortho-hydroxy Schiff bases was carried out, and the corresponding crystal structures were analyzed in order to identify their characteristic hydrogen bonding patterns. The X-ray analysis showed that the enol (O-H...N) tautomer is the most stable in compounds 1-3 whereas the keto (N-H...O) form is preferred in compounds 4-7. The specific intermolecular O-H...O hydrogen bonding interactions that control the supramolecular arrangement of each tautomer are discussed. Additionally, a complete characterization of the polycrystalline samples was attained using solid-state NMR and IR experiments. Solution VT NMR and UV-visible experiments were also used to obtain valuable insights about the nature and stability of the tautomers. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2011.
Study of the Reaction of Tridentate Ligands with Ferrocenyl Boronic Acid
Barba, Victor,Xochipa, Rubi,Santillan, Rosa,Farfan, Norberto
, p. 118 - 124 (2007/10/03)
Evaluation of the reactivity of eight tridentate ligands derived from amino alcohols and salicylaldehyde, 2-hydroxyacetophenone, or 2-hydroxybenzophenone with ferrocenyl boronic acid has shown that the reaction leads to both monomeric and dimeric ferrocen
Synthesis of 3-alkylamino-3-(2-hydroxyaryl)-1-polyfluoroalkylprop-2-en-1- ones and 2-polyfluoroalkyl-4H-chromen-4-imines
Sosnovskikh,Usachev
, p. 383 - 392 (2007/10/03)
Condensation of Schiff's bases (prepared from 2-hydroxy- or 2-hydroxy-5-methylacetophenones and primary amines) with ethyl polyfluoroalkanoates in the presence of LiH in THF affords 3-alkylamino-3-(2- hydroxyaryl)-1-polyfluoroalkylprop-2-en-1-ones, which
Synthetic, biocatalytic acetylation and anti-tuberculosis activity evaluation studies on (±)-4-alkyl-3,4-dihydro-3-ω -hydroxyalkyl-2H-1,3-benzoxazines
Shakil, Najam A.,Dhawan, Ashish,Sharma, Nawal K.,Kumar, Vijayendra,Kumar, Sujeet,Bose, Mridula,Raj, Hanumantharao G.,Olsen, Carl E.,Cholli, Ashok L.,Samuelson, Lynne A.,Kumar, Jayant,Watterson, Arthur C.,Parmar, Virinder S.,Prasad, Ashok K.
, p. 1958 - 1969 (2007/10/03)
Five novel (±)-4-alkyl-3,4-dihydro-3-ω -hydroxyalkyl-2H-1,3-benzoxazines have been synthesized by Mannich-type condensation of N-ω-hydroxyalkyl, N-[1-(2-hydroxyphenyl)ethyl/propyl] amine and formaldehyde in 55 to 60% yields. Porcine pancreatic lipase in t
