Showing papers on "Tetrahydrofuran published in 1972"
TL;DR: The one step reaction of aromatic Grignard reagents with elemental tellurium in tetrahydrofuran, followed by oxidation of the intermediates, produced diphenyl ditelluride in 80% yield as mentioned in this paper.
146 citations
TL;DR: In this paper, the stochastic and kinetics of the reaction between Grignard reagents and alkyl halides with a copper catalyst have been examined in tetrahydrofuran solutions.
95 citations
58 citations
TL;DR: A series of monoalkylchromium complexes, RCrCl 2 (THF) 3 where R = methyl, ethyl, n-propyl and isobutyl and THF = tetrahydrofuran, have been prepared by reactions of chromium trichloride with organoaluminum compounds as mentioned in this paper.
57 citations
TL;DR: Tetrakis(tetrahydrofuran)lithium tetrakis (2,6-dimethylphenyl)lutetiate has been prepared; a single-crystal X-ray study has shown that the anion consists of four 2,6dimethyl phenyl groups in an approximately tetrahedral σ-bonded array about lutetium as mentioned in this paper.
Abstract: Tetrakis(tetrahydrofuran)lithium tetrakis(2,6-dimethylphenyl)lutetiate has been prepared; a single-crystal X-ray study has shown that the anion consists of four 2,6-dimethylphenyl groups in an approximately tetrahedral σ-bonded array about lutetium.
52 citations
TL;DR: In this paper, a solution of aluminium chloride and lithium aluminium hydride in a tetrahydrofuran-benzene mixed solvent was used for electrodeposition of aluminium.
46 citations
TL;DR: In this article, the kinetics and stoichiometry of nitrogen fixation in tetrahydrofuran (THF) systems were studied. And the initial rate was first order with respect to the amounts of MCL3, Mg, and nitrogen pressure, and a mechanism involving the complexation of N2 with dimeric M(II) species was proposed and discussed.
Abstract: The kinetics and stoichiometry of nitrogen fixation with TiCl3-Mg and VCl3-Mg in tetrahydrofuran (THF) systems were studied. The systems react with molecular nitrogen at room temperature and normal pressure giving magnesium dichloride and nitrogen-containing complexes of compositions [MNMg2Cl2(THF)], where M=Ti and V, according to the stoichiometry: MCl3(THF)3+\frac52Mg+\frac12N2→[MNMg2Cl2(THF)]+\frac12MgCl2(THF)2. Properties of the isolated nitrogen-containing complexes were examined. Reactions under argon and hydrogen gave hydride-containing complexes. The initial rate of nitrogen fixation was first order with respect to the amounts of MCL3, Mg, and nitrogen pressure. A mechanism involving the complexation of N2 with dimeric M(II) species followed by rate-determining process to react with magnesium is proposed and discussed.
44 citations
41 citations
TL;DR: In this paper, the reaction of organic halides with carbonyl compounds in the presence of lithium or sodium and with tetrahydrofuran as solvent have been studied.
Abstract: The reactions of organic halides with carbonyl compounds in the presence of lithium or sodium and with tetrahydrofuran as solvent have been studied. When lithium is used alcohols are formed in high yield which in many cases exceed those obtained by the analogous Grignard reaction. The process involves the intermediate formation of organo-lithium species. With sodium, the yield of alcohol is significantly reduced and with carbonyl compounds possessing α-hydrogen atoms, hydrogen abstraction by the intermediate organo-sodium species predominates. The effect of the addition of electron-transfer reagents such as naphthalene or biphenyl to the sodium system has been studied and the yields of alcohols have been shown to increase with the concentration of additive present.
39 citations
TL;DR: In this paper, the reaction between various Grignard reagents and silver(I) salts in the presence of nitrogen-containing oxidants such as lithium nitrate, nitrogen dioxide, and methyl nitrate has been examined in tetrahydrofuran solutions.
Abstract: The reaction between various Grignard reagents and silver(I) salts in the presence of nitrogen-containing oxidants such as lithium nitrate, nitrogen dioxide, and methyl nitrate has been examined in tetrahydrofuran solutions Coupling dimer is formed in high yields almost independently of the structure of the Grignard reagent From the stoichiometry, it is concluded that these oxidants oxidize two equivalents of metallic silver formed in situ to silver(I) species under proper reaction conditions Other transition metal halides are also oxidized by these oxidants in a similar manner Soluble forms of reduced silver complexes formed in the reaction of silver(I) nitrate and Grignard reagent are also described
38 citations
TL;DR: In this article, the spectroscopic properties of the ortho-metallated (phenylazo)phenyl-2C,N′ ligand and its corresponding complexes are summarized.
TL;DR: In this article, three competing dehydrohalogenation mechanisms were shown to take place by 1-halocyclohexenes and 1-halo-4-methylcyclohexene with potassium t-butoxide (t-BuOK) in dimethyl sulfoxide and tetrahydrofuran.
TL;DR: In this paper, a compound was identified as Na-[Co(I)TPP]·5THF (tetraphenylporphin is abbreviated to TPP).
Abstract: Cobalt(I) tetraphenylporphin was prepared by reduction of tetraphenylporphinatocobalt(II) with sodium benzophenone ketyl in tetrahydrofuran (THF) and was purely isolated. The compound was identified as Na-[Co(I)TPP]·5THF (tetraphenylporphin is abbreviated to TPP). On the basis of electronic absorption spectrum, magnetic circular dichroism, magnetic susceptibility and NMR spectrum, the complex formed was concluded to be a complex of cobalt(I). Although some part of cobalt electron is migrated into the conjugated system of porphin, an electron furnished by the reducing reagent is mainly trapped by the central cobalt. The compound should be named sodium tetraphenylporphinatocobaltate(I).
TL;DR: In this paper, the authors investigated the kinetics of tetrahydrofuran by ruthenium tetroxide in aqueous perchloric acid solutions and found that the rate of reaction was directly dependent on the co...
Abstract: The kinetics of the oxidation of tetrahydrofuran by ruthenium tetroxide in aqueous perchloric acid solutions have been investigated. The rate of reaction is found to be directly dependent on the co...
TL;DR: In this paper, the molybdenum complex has been analyzed and the presence of a non-classical allylic system on the metal has been revealed, which is thought to be oxonium salts.
TL;DR: In this article, a number of lithium and sodium salts in acetone and in tetrahydrofuran solutions in the 0·01-0·15 M concentration range were determined for a series of properties.
TL;DR: In this article, it was shown that formaldehyde exists as a monomer (form A) in nonpolar solvents to a temperature of approximately −95°C, and formation of a formaldehyde polymer (form C) begins which is thermally reversible at temperatures > −90°C.
Abstract: Absorption, emission, and NMR studies indicate that: (1) Formaldehyde exists as a monomer (form A) in nonpolar solvents to a temperature of approximately −95°C, (2) at −95°C in nonpolar solvents, formation of a formaldehyde polymer (form C) begins which is thermally reversible at temperatures > −90°C. The form C also exists at room temperature in water, dimethyl sulfoxide, dimethylformamide, and tetrahydrofuran. The formaldehyde‐formaldehyde interaction is principally of a dipole‐dipole type. (3) Formaldehyde can act as a hydrogen‐bonding donor or acceptor in a complex with solvent molecules or silica gel (form B). In aromatic hydrocarbons, formaldehyde acts as a donor whereas in 2‐methyltetrahydrofuran, chloroform, and silica gel it acts as an acceptor. Also, in 2‐methyltetrahydrofuran, forms A and B exist in addition to C. Monomer formaldehyde exhibits a fluorescence from the lowest Sn,π* state in nonpolar solvents to −95°C. Both the forms B and C exhibit emission. In addition to the classification of t...
TL;DR: The temperature dependence of the rate of solvolysis of t-butyl chloride in mixtures of tetrahydrofuran and of acetonitrile in water was determined in this paper.
Abstract: The temperature dependence of the rate of solvolysis of t-butyl chloride in mixtures of tetrahydrofuran and of acetonitrile in water have been determined. In the high-water range both minor co-solv...
TL;DR: In this article, the crystal and molecular structures of sodium pentaphenylchromate were determined by a three-dimensional X-ray analysis, and a distorted trigonal bipyramidal configuration was found for the arrangement of the five phenyl ligands about the five-coordinate CrIII ion.
TL;DR: In this paper, the electronic spectrum of tetrahydrofuran has been measured between 2000 and 1200 A in the gas phase and a new interpretation was given for some of the observed bands.
TL;DR: The reaction of benzaldehyde with zinc-α-bromonitrile is not influenced by the nature of the solvent as discussed by the authors, and the expected 1,4-addition products are obtained.
TL;DR: The difference in reactivity of lithium anilides towards hexafluorobenzene in different solvents has been described in this article, where a mixture of tetrahydrofuran and hexamethylphosphoric triamide lithium N-methylanilide gave a 1,2,4,5-tetrasubstituted compound.
TL;DR: The structure of [Na(THF) 2 ] 2 [Al(CH 3 ) 2 C 14 H 10 ] 2 has been determined by three-dimensional X-ray crystallographic techniques.