Search results for "Methylene"
showing 10 items of 821 documents
Methylation as an effective way to generate SOD-activity in copper complexes of scorpiand-like azamacrocyclic receptors
2018
Abstract Methylation of the secondary amine groups of a scorpiand-type ligand consisting of a pyridine spacer connected through methylene groups to a tris(2-aminomethyl) unit with the pendant arm further functionalised with a 3-pyridine unit leads to a ligand whose Cu(II) complex exhibits threefold enhanced SOD activity with respect to the non-methylated ligand. Potentiometric studies indicate the formation of [CuL] 2+ species with a stability three orders of magnitude lower than that formed with the related non-methylated ligand. Kinetic studies indicate that methylation of the secondary nitrogens causes a deceleration of both the complex formation and the acid-induced dissociation of the …
Darstellung einiger oligomerer Cyclo{oligo[(2-hydroxy-1,3-phenylen)methylen]}e. Spektroskopische Untersuchung ihrer Pseudorotation
1978
Es wird die Darstellung von Cyclo{tris[(2-hydroxy-5-methyl-1,3-phenylen)methylen]-(2-hydroxy-5-tert-butyl-1,3-phenylen)methylen} (4a), Cyclo{bis[(2-hydroxy-5-methyl-1,3-phenylen)methylen]-bis[(2-hydroxy-5-tert-butyl-1,3-phenylen)methylen]}(4b) und Cyclo-{pentakis[(2-hydroxy-5-methyl-1,3-phenylen)methylen]} (4c) beschrieben. Die IR-Spektren zeigen, das die phenolischen Hydroxygruppen der Vierringverbindungen 4a und 4b intramolekulare, vom Losungs(CCl4)- oder Zerteilungsmittel (KBr) weitgehend unabhangige Wasserstoffbrucken bilden, die bei der pentameren Ringverbindung 4c schwacher sind. Anhand der 1H-NMR-Spektren last sich bei diesen Verbindungen eine Pseudorotation nachweisen. Die Massenspe…
Oxovanadium(V) complexes with tripodal bisphenolate and monophenolate ligands: Syntheses, structures and catalytic activities
2019
Abstract The reactions between [VO(acac)2] (acac– = acetylacetonate) and the tripodal amino bisphenols 6,6′-(((2-morpholinoethyl)azanediyl)bis(methylene))bis(2,4-di-tert-butylphenol) (H2L1) and 6,6′-(((thiophen-2-ylmethyl)azanediyl)bis(methylene))bis(2,4-di-tert-butylphenol) (H2L2) as well as the tetradentate amino phenol 2,2′-((3,5-di-tert-butyl-2-hydroxybenzyl)azanediyl)bis(ethan-1-ol) (H3L3) afford the complexes [VO(L1)(OMe)] (1), [VO(L2)(acac)] (2) and [VO(L3)] (3), correspondingly. Complexes 1 and 3 can also be prepared using VOSO4·xH2O or [VO(OPr)3] as vanadium precursors. When [VO(acac)2] or VOSO4·xH2O is used, mononuclear oxovanadium(V) complexes are formed upon oxidation of the met…
CCDC 104970: Experimental Crystal Structure Determination
2000
Related Article: I.Taden, Hak-Chul Kang, W.Massa, T.P.Spaniol, J.Okuda|2000|Eur.J.Inorg.Chem.||441|doi:10.1002/(SICI)1099-0682(200003)2000:3<441::AID-EJIC441>3.0.CO;2-M
CCDC 270841: Experimental Crystal Structure Determination
2005
Related Article: J.-P.Costes, S.Shova, J.M.C.Juan, N.Suet|2005|Dalton Trans.||2830|doi:10.1039/b506102d
CCDC 1059034: Experimental Crystal Structure Determination
2015
Related Article: Z. Setifi, A. Valkonen, M.A. Fernandes, S. Nummelin, H. Boughzala, F. Setifi, C. Glidewell|2015|Acta Crystallogr.,Sect.E:Cryst.Commun.|71|509|doi:10.1107/S2056989015007306
CCDC 1492179: Experimental Crystal Structure Determination
2016
Related Article: K. Begum, M.C. Sheikh, R. Miyatake, E. Zangrando, M.S. Begum|2016|IUCrData|1|x161132|doi:10.1107/S2414314616011329
CCDC 1434703: Experimental Crystal Structure Determination
2016
Related Article: Christian Köhler and Eva Rentschler|2016|Eur.J.Inorg.Chem.||1955|doi:10.1002/ejic.201501278
CCDC 738970: Experimental Crystal Structure Determination
2010
Related Article: O.Wichmann, H.Sopo, E.Colacio, A.J.Mota, R.Sillanpaa|2009|Eur.J.Inorg.Chem.||4877|doi:10.1002/ejic.200900684
CCDC 1417838: Experimental Crystal Structure Determination
2015
Related Article: Gopal C. Giri, Ayan Patra, Gonela Vijaykumar, Luca Carrella, Manindranath Bera|2015|RSC Advances|5|99270|doi:10.1039/C5RA16555E