Results 231 to 240 of about 8,250 (257)

Gas-Phase Metal Trications in Protic Solvent Complexes

Journal of the American Chemical Society, 2002
In the first observation of triply charged metal ions microsolvated by protic ligands, gas-phase complexes of 11 different metal trications with diacetone alcohol were generated using electrospray ionization. These species were found to exist for at least five to eight ligands, depending on the metal.
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Photochemistry of 5-aminoquinoline in protic and aprotic solvents

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
Photophysical properties of 5-aminoquinoline (5AQ) have been investigated in various non-polar and polar (protic and aprotic) solvents using steady state and time resolved fluorescence. In aprotic solvents, the spectral maxima depend on the polarity. However, in protic solvents both the fluorescence intensity as well decay time show decrease depending ...
Jagat P, Bridhkoti, Hirdyesh, Mishra, H C, Joshi, Sanjay, Pant   +3 more
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Photochemical addition of protic solvents to 1-phenylcycloalkenes

Tetrahedron, 1971
Abstract Direct photolysis of 6–8-membered 1-phenylcycloalkenes (1a–1c) dissolved in acetic or propionic acid gives mainly the corresponding esters (2), which are also obtained in the acetophenone-sensitized reactions. Minor products in the direct photolysis of 1a and 1b are hydrogenation (3) and alkylation products (4), while 8-membered 1c yields 1 ...
S. Fujita, Y. Hayashi, T. Nômi, H. Nozaki   +3 more
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On the Roles of Protic Solvents in Imidazolidinone‐Catalyzed Transformations

Angewandte Chemie International Edition, 2011
Step by step: The effect of protic solvents on the rate and stereochemical outcome of the imidazolidinone-catalyzed Diels–Alder cycloaddition was rationalized. The following picture emerges: the solvent accelerates iminium ion formation (step 1), the Diels–Alder cycloaddition is reversible (step 2), and the solvent intercepts the iminium ion adduct ...
Brazier, John B., Jones, Kevin M., Platts, James A., Tomkinson, Nicholas C.O.   +3 more
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Solvent-free transformation of protic ionic liquids into zwitterions

Chemical Communications
Protic ionic liquids containing a vinyl-sulfonylamide anion catalytically transformed into zwitterions upon addition of a base under solvent-free conditions.
Yosuke Nakazono, Ryota Inoue, Ryo Sumitani, Tomoyuki Mochida   +3 more
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Chemistry of methylgallium(III) compounds in protic solvents

Organometallics, 1987
Abstract : The chemical properties of as well as routes to the formation of methylgallium (III) compounds in aqueous acidic solutions and in other protic solvents have been investigated. Aqueous perchloric acid solutions of Me2GaC10 at room temperature are surprisingly resistant to hydrolytic cleavage of the gallium-carbon bond.
O. T. Beachley, R. U. Kirss, R. J. Bianchini, T. L. Royster   +3 more
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Substitution reactions of trans-[PtL2Cl2] in protic solvents

Journal of Inorganic and Nuclear Chemistry, 1966
Abstract An investigation of the nucleophilic substitutions of trans-[PtL2Cl2], L = P(C2H5)3 or piperidine, with 36Cl−, Br−, N3−, I− and SCN− in methyl, ethyl and butyl alcohols at 40°C is reported. The rate determining step is the substitution of the first chloride atom. The pseudo-first order rate constants, kobs.sec−1, are consistent with the two
G. Faraone, U. Belluco, V. Ricevuto, R. Ettorre   +3 more
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Hydrogen-bonded capsules in polar, protic solvents.

Chemical communications (Cambridge, England), 2002
A kinetically stable, dimeric capsule is formed by tetrahydroxyresorcinarene in methanol; it encapsulates tropylium and tetramethylammonium cations.
A, Shivanyuk, J, Rebek
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Chimeric Behavior of Excited Thioxanthone in Protic Solvents: II. Theory

The Journal of Physical Chemistry A, 2014
The chimeric behavior of thioxanthone in protic solvents has been investigated employing computational chemistry methods. In particular, methanol and 2,2,2-trifluoroethanol have been chosen in this study. The solvent environment has been modeled using microsolvation in combination with a conductor-like screening model.
Vidisha, Rai-Constapel, Torben, Villnow, Gerald, Ryseck, Peter, Gilch, Christel M, Marian   +4 more
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Unprecedented high fluorescence anisotropy in protic solvents: Hydrogen bond induced solvent caging?

Chemical Physics Letters, 2016
Atypical high fluorescence anisotropy has been revealed in protic solvents for excited state intramolecular proton transfer (ESIPT) prone 3-hydroxyflavone and some of its hydroxy derivatives. In non-protic solvents, however, the anisotropy values are low.
Sinjan Das, Saptarshi Ghosh, Nitin Chattopadhyay   +2 more
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