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Preparation and I.R. spectra of tin(IV) chloride complexes with acridine and piperazine have been described and their structures have been suggested. 相似文献
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《Polyhedron》2001,20(15-16):2089-2093
The reaction of [Ir(COD)Cl]2 with 2-(arylazo)pyridine (L) in dichloromethane solution has afforded the nonelectrolytic pentacoordinated species of type Ir(L)(COD)(Cl) from which the corresponding bromides and iodides have been synthesised by metathesis (COD=1,5-cyclooctadiene). L ligands used are: 2-(phenylazo)pyridine (L1); 2-(m-tolylazo)pyridine (L2) and 2-(p-chlorophenylazo)pyridine (L3). The X-ray structures of Ir(L2)(COD)(Cl)·0.5 CH2Cl2 and Ir(L3)(COD)(I) have been determined revealing square-pyramidal geometry. The relatively short IrN(azo) lengths (∼2.00 Å) and the relatively long NN bond distance (∼1.30 Å) are consistent with significant dππ* (azo) back-bonding. The HOMO (50% Ir and 15% azo character) and LUMO (50% azo and 30% Ir character) are primarily localised in the IrL fragment and the absorption bands near 600 nm is assigned tentatively to the HOMO→LUMO transition. The stability of the pentacoordinated structures and the inertness to oxidative addition of the present complexes in contrast to the behaviour of corresponding 2,2′-bipyridine species (tetracoordinated, reactive) is rationalised in terms of π-acidity order L≫bpy. 相似文献
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Lydie Labaudiniere Yves Leroux Ramon Burgada 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4)
Abstract Pentaoxyphosphoranes are closely related as intermediates to the biologically important phosphate ester reactions. Thus, the hydrolysis of phosphoenolpyruvate 1, a strong phosphorylating agent, proceeds most probably via the formation of the cyclic acyloxyphosphorane 2. 相似文献
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M. I. Kabachnik D. I. Lobanov N. V. Matrosova P. V. Petrovskii A. N. Nesmeyanov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4)
Abstract A new method is developed for the synthesis of phosphoranes (IIIa-d) and phosphorates (IVa-d) starting from substituted o-benzoquinones(Ia-d), catechols(IIa-d) and white phosphorus. 相似文献
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Heinrich L Li Y Vaissermann J Chottard G Chottard JC 《Angewandte Chemie (International ed. in English)》1999,38(23):3526-3528
Postcoordination oxidation by dioxygen of one of the thiolate groups in a pentadentate N(2)S(3) ligand results in an iron(III) complex with two N-carboxamido, two thiolato, and one O-sulfinato ligands (see the CAMERON representation). This novel mixed coordination is similar to that determined for the inactive form of the nitrile hydratase from Rhodococcus sp. N-771, but differs by the O versus S binding of the sulfinato ligand. 相似文献
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Use of an alternative aluminium(iii) starting material has led to the isolation of a new aluminium(ii) diiododialane, which functions as an intermediate in the synthesis of (Cp*Al)(4), reacts oxidatively with methyllithium, and undergoes oxidative cleavage of the Al-Al bond with an aryl azide. 相似文献
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Matson EM Crestani MG Fanwick PE Bart SC 《Dalton transactions (Cambridge, England : 2003)》2012,41(26):7952-7958
Addition of organic azides, N(3)R (R = 2,4,6-trimethylphenyl (Mes), phenyl (Ph), 1-adamantyl (Ad)), to a solution of the uranium(III) alkyl complex, Tp*(2)U(CH(2)Ph) (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate) (1), results in the formation of a family of uranium(iv) imido derivatives, Tp*(2)U(NR) (2-R). Notably, these complexes were synthesized in high yields by coupling of the benzyl groups to form bibenzyl. The uranium(IV) imido derivatives, 2-Mes, 2-Ph, and 2-Ad, were all characterized by both (1)H NMR and IR spectroscopy, and 2-Mes and 2-Ad were also characterized by X-ray crystallography. In the molecular structure of 2-Mes, typical κ(3)-coordination of the Tp* ligands was observed; however in the case of 2-Ad, one pyrazole ring of a Tp* ligand has rotated away from the metal centre, forcing a κ(2)-coordination of the pyrazoles. This results in a uranium-hydrogen interaction with the Tp* B-H. Treating these imido complexes with para-tolualdehyde results in multiple bond metathesis, forming the terminal uranium(IV) oxo complex, Tp*(2)U(O), and the corresponding imine. 相似文献
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L. K. Papernaya A. A. Shatrova A. I. Albanov E. V. Rudyakova G. G. Levkovskaya 《Chemistry of Heterocyclic Compounds》2012,47(11):1395-1404
A simple method has been developed for the synthesis of water-soluble pyrazole derivatives, namely 4-[bis(2-hydroxyethylsulfanyl)methyl]pyrazoles
hydrochlorides, by the reaction of a series of pyrazole carbaldehydes with 2-mercaptoethanol in the presence of trimethylchlorosilane.
When treated with aqueous ammonia solution the pyrazole-4-carbaldehydes bis(2-hydroxyethyl)dithioacetal hydro-chlorides are
converted to the 4-[bis(2-hydroxyethylsulfanyl)methyl]pyrazole free bases. 相似文献
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The anion [(OH)3(O)AsCH2As(O)(OH)2] has been trapped in an X-irradiated single crystal of methylene diarsonic acid. The g -tensor and the hyperfine coupling tensors of the two 75As-nuclei have been obtained and the spin densities in the arsenic 4s- and 4p-orbitals determined. 相似文献
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Hua Fu Jing-Hua Xu Ru-Ji Wang Zhong-Zhou Chen Guang-Zhong Tu Qin-Zhu Wang 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1963-1971
Pentacoordinated phosphoranes containing valine or iso-leucine residue (2-phenyl-2,75-spiro[1,3,2-phenanthrodioxaphosphole-2,2′-1,3,2-oxazaphospholan]-5′-one) were synthesized through sequential two-step reactions, whereby the reaction products of phenyldichlorophosphine with N,O-bis(trimethylsilyl)valine or iso-leucine were followed by the addition of phenanthrenequione, and the crystals of 4a and 4b were obtained from benzene and hexane mixed solution. The x-ray structure of the crystals 4a and 4b revealed that they are distorted TBP, exhibiting RP absolute configuration. The 31P NMR spectra showed that the SP diastereomer could transfer into the other one RP that came out from the solution during crystallization. Correspondingly, when it was dissolved in solvents the RP diastereomer transferred into the other one SP, and the pair of diastereomers changed each other in solution at room temperature through a phosphonium carboxylate zwitterions intermediate. 相似文献
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