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Showing 9985 to 9996 of 16784 entries
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A new route for generation of alpha-lambda3-iodanyl ketones via ester exchange of (Z)-(beta-acetoxyvinyl)-lambda3-iodanes: their nucleophilic substitutions with halides and sulfur and phosphorus nucleophiles.

The Journal of organic chemistry

Ochiai M, Nishitani J, Nishi Y.
PMID: 12076135
J Org Chem. 2002 Jun 28;67(13):4407-13. doi: 10.1021/jo0107711.

An efficient method for generation of alpha-lambda3-iodanyl ketones from (Z)-(2-acetoxyvinyl)(phenyl)-lambda3-iodanes was developed. The method involves ester exchange of (Z)-2-acetoxyvinyl-lambda3-iodanes with methanol in the presence of triethylamine. alpha-lambda3-Iodanyl ketones react with a variety of nucleophiles such as halides, thiols, phosphines,...

Iron-Semiquinone, Semiquinone-Semiquinone, and Iron-Iron Magnetic Exchange in Monomeric and Dimeric Ferric Complexes Containing the 3,6-Di-tert-butyl-1,2-semiquinonate Ligand.

Inorganic chemistry

Attia AS, Conklin BJ, Lange CW, Pierpont CG.
PMID: 11666281
Inorg Chem. 1996 Feb 14;35(4):1033-1038. doi: 10.1021/ic950595c.

Fe(3,6-DBSQ)(3) has been prepared by reacting 3,6-di-tert-butyl-1,2-benzoquinone with Fe(CO)(5). The complex has been characterized structurally [orthorhombic, Pbca, a = 18.277(5) Å, b = 11.634(3) Å, c = 39.903(10) Å, V = 8485(4) Å(3), Z = 8, R = 0.063],...

Effects of liquid phase composition on salt cluster formation in positive ion mode electrospray mass spectrometry: implications for clustering mechanism in electrospray.

Journal of the American Society for Mass Spectrometry

Charles L, Pépin D, Gonnet F, Tabet JC.
PMID: 11605968
J Am Soc Mass Spectrom. 2001 Oct;12(10):1077-84. doi: 10.1016/S1044-0305(01)00290-2.

Potassium bromate salt clusters, [KBrO3]nKx(x+), formed by electrospray ionization were studied as a function of solution properties. Clusters with up to 4 positive charges were observed. Their abundance, charge state and distribution were shown to vary with the organic...

Reaction Mechanism for Olefin Exchange at Chloro Ethene Complexes of Platinum(II).

Inorganic chemistry

Plutino MR, Otto S, Roodt A, Elding LI.
PMID: 11670907
Inorg Chem. 1999 Mar 22;38(6):1233-1238. doi: 10.1021/ic981020t.

Complex equilibria in methanol/chloroform/dichloromethane solutions containing Zeise's anion, [PtCl(3)(C(2)H(4))](-) (1), the solvento species, trans-[PtCl(2)(C(2)H(4))(MeOH)] (2), and the dinuclear complex, trans-[PtCl(2)(C(2)H(4))](2) (3), have been studied by UV-vis, (1)H, and (195)Pt NMR spectroscopy, giving average values of K(Cl) = (1.6 +/-...

Encapsulation of N(2), O(2), methanol, or acetonitrile by decamethylcucurbit[5]uril(NH(4)(+))(2) complexes in the gas phase: influence of the guest on "lid" tightness.

Journal of the American Chemical Society

Kellersberger KA, Anderson JD, Ward SM, Krakowiak KE, Dearden DV.
PMID: 11697985
J Am Chem Soc. 2001 Nov 14;123(45):11316-7. doi: 10.1021/ja017031u.

No abstract available.

A New Coupling Reaction of Alkyl Iodides with Electron Deficient Alkenes Using Nickel Boride (cat.)-Borohydride Exchange Resin in Methanol.

The Journal of organic chemistry

Sim TB, Choi J, Joung MJ, Yoon NM.
PMID: 11671567
J Org Chem. 1997 Apr 18;62(8):2357-2361. doi: 10.1021/jo961751f.

The radical addition reaction of alkyl iodides with alpha,beta-unsaturated esters, nitriles, and ketones proceeds in moderate to excellent yields (50-95%) using Ni(OAc)(2) (0.05-0.2 equiv)-BER (3-5 equiv) in methanol in 1-9 h at room temperature or at 65 degrees C....

New diphosphine ligands containing ethyleneglycol and amino alcohol spacers for the rhodium-catalyzed carbonylation of methanol.

Chemistry (Weinheim an der Bergstrasse, Germany)

Thomas CM, Mafua R, Therrien B, Rusanov E, Stoeckli-Evans H, Süss-Fink G.
PMID: 12203315
Chemistry. 2002 Aug 02;8(15):3343-52. doi: 10.1002/1521-3765(20020802)8:15<3343::AID-CHEM3343>3.0.CO;2-Z.

The new diphosphine ligands Ph(2)PC(6)H(4)C(O)X(CH(2))(2)OC(O)C(6)H(4)PPh(2) (1: X=NH; 2: X=NPh; 3: X=O) and Ph(2)PC(6)H(4)C(O)O(CH(2))(2)O(CH(2))(2)OC(O)C(6)H(4)PPh(2) (5) as well as the monophosphine ligand Ph(2)PC(6)H(4)C(O)X(CH(2))(2)OH (4) have been prepared from 2-diphenylphosphinobenzoic acid and the corresponding amino alcohols or diols. Coordination of the diphosphine...

Selective adduct formation by furan chemical ionization reagent in gas chromatography ion trap mass spectrometry.

Journal of mass spectrometry : JMS

Tzing SH, Ghule A, Chang JY, Ling YC.
PMID: 12717752
J Mass Spectrom. 2003 Apr;38(4):401-8. doi: 10.1002/jms.452.

The analytical potential of furan as a chemical ionization (CI) reagent was evaluated for selectivity with nine monosubstituted naphthalene compounds. The ion-molecule reactions of furan and tetrahydrofuran (THF) were compared with those of methane, methanol and acetonitrile (prominently producing...

Solvent switching of intramolecular energy transfer in bichromophoric systems: photophysics of (2,2'-bipyridine)tetracyanoruthenate(II)/pyrenyl complexes.

Inorganic chemistry

Indelli MT, Ghirotti M, Prodi A, Chiorboli C, Scandola F, McClenaghan ND, Puntoriero F, Campagna S.
PMID: 12950195
Inorg Chem. 2003 Sep 08;42(18):5489-97. doi: 10.1021/ic034185x.

The supramolecular systems [Ru(Pyr(n)bpy)(CN)(4)](2-) (n = 1, 2), where one and two pyrenyl units are linked via two-methylene bridges to the [Ru(bpy)(CN)(4)](2-) chromophore, have been synthesized. The photophysical properties of these systems, which contain a highly solvatochromic metal complex...

New chloro, mu-oxo, and alkyl derivatives of dioxomolybdenum(VI) and -tungsten(VI) complexes chelated with N(2)O tridentate ligands: synthesis and catalytic activities toward olefin epoxidation.

Inorganic chemistry

Wong YL, Ng DK, Lee HK.
PMID: 12354062
Inorg Chem. 2002 Oct 07;41(20):5276-85. doi: 10.1021/ic020173k.

A new series of cis-dioxomolybdenum(VI) complexes MoO(2)(L(n))Cl (n = 1-5) were prepared by the reaction of MoO(2)Cl(2)(DME) (DME = 1,2-dimethoxyethane) with 2-N-(2-pyridylmethyl)aminophenol (HL(1)) or its N-alkyl derivatives (HL(n)) (n = 2-5) in the presence of triethylamine. The new mu-oxo...

meso-5,5,7,12,12,14-Hexamethyl-4,11-diaza-1,8-diazoniacyclotetradecane (S)-malate(2-) methanol disolvate: a chain of rings generated by two pairs of N-H.O hydrogen bonds.

Acta crystallographica. Section C, Crystal structure communications

Bowes KF, Ferguson G, Lough AJ, Glidewell C.
PMID: 12794354
Acta Crystallogr C. 2003 Jun;59:o329-31. doi: 10.1107/s010827010300920x. Epub 2003 May 20.

The title compound is a methanol-solvated salt, C(16)H(38)N(4)(2+).C(4)H(4)O(5)(2-).2CH(3)OH, in which the ionic components are linked into chains by two pairs of N-H.O hydrogen bonds [H.O = 1.78-2.21 A, N.O = 2.702 (14)-3.094 (8) A and N-H.O = 160-179 degrees...

Steric and electronic effects on the reactivity of rh and ir complexes containing P-S, P-P, and P-O ligands. Implications for the effects of chelate ligands in catalysis.

Journal of the American Chemical Society

Gonsalvi L, Adams H, Sunley GJ, Ditzel E, Haynes A.
PMID: 12418915
J Am Chem Soc. 2002 Nov 13;124(45):13597-612. doi: 10.1021/ja0176191.

Kinetic studies of the reactions of [M(CO)(L-L)I] [M = Rh, Ir; L-L = Ph(2)PCH(2)P(S)Ph(2) (dppms), Ph(2)PCH(2)CH(2)PPh(2) (dppe), and Ph(2)PCH(2)P(O)Ph(2) (dppmo)] with methyl iodide have been undertaken. All the chelate ligands promote oxidative addition of methyl iodide to the square...

Showing 9985 to 9996 of 16784 entries