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Showing 9985 to 9996 of 22319 entries
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Understanding the formation of new clusters of alkali and alkaline Earth metals: a new synthetic approach, single-crystal structures, and theoretical calculations.

Journal of the American Chemical Society

Fromm KM, Gueneau ED, Bernardinelli G, Goesmann H, Weber J, Mayor-López MJ, Boulet P, Chermette H.
PMID: 12643722
J Am Chem Soc. 2003 Mar 26;125(12):3593-604. doi: 10.1021/ja0205737.

A new synthetic approach, reacting alkaline earth metal iodides with butyllithium, lithium hydroxide, and/or lithium butoxide under salt elimination, is presented, giving access to some interesting clusters of calcium, strontium, and barium, partially in combination with lithium. The so...

Electro-optic measurement of the wake fields of a relativistic electron beam.

Physical review letters

Fitch MJ, Melissinos AC, Colestock PL, Carneiro JP, Edwards HT, Hartung WH.
PMID: 11461560
Phys Rev Lett. 2001 Jul 16;87(3):034801. doi: 10.1103/PhysRevLett.87.034801. Epub 2001 Jun 26.

When a relativistic electron bunch traverses a structure, strong electromagnetic fields are induced in its wake. For a 12 nC bunch of duration 4.2 ps FWHM, the peak field is measured >0.5 MV/m. Time resolution of approximately 5 ps...

Structural effects on polyether cationization by alkali metal ions in matrix-assisted laser desorption/ionization.

Journal of the American Society for Mass Spectrometry

Wang Y, Rashidzadeh H, Guo B.
PMID: 10883819
J Am Soc Mass Spectrom. 2000 Jul;11(7):639-43. doi: 10.1016/s1044-0305(00)00119-7.

Structural effects on polyether cationization in matrix-assisted laser desorption/ionization (MALDI) are investigated using three different polyethers: PEG (polyethylene glycol), PPG (polypropylene glycol), and PTHF (polytetrahydrofuran). This study was performed using equimolar cesium and lithium chlorides as the cationizing agent....

Preparation and X-ray structures of Cu(I), Ni(II), and Pd(II) (N,S) complexes of the monoanion [(tBuN)(S)P(mu-N(t)Bu)2P(S)(NH(t)Bu)]- and a Pt(II) (S,S') complex of the dianion [((t)BuN)(S)P(mu-N(t)Bu)2P(S)(N(t)Bu)]2-.

Inorganic chemistry

Chivers T, Fedorchuk C, Krahn M, Parvez M, Schatte G.
PMID: 11312752
Inorg Chem. 2001 Apr 09;40(8):1936-42. doi: 10.1021/ic001173s.

The metathetical reactions of the lithium derivative of the monoanion [((t)BuN)(S)P(mu-N(t)Bu)(2)P(S)(NH(t)Bu)](-) (L) with CuCl/PPh(3), NiCl(2)(PEt(3))(2), PdCl(2)L'(2) (L' = PhCN, PPh(3)), and PtCl(2)(PEt(3))(2) produced the complexes (PPh(3))CuL (5), NiL(2) (6), PdCl(L)(PPh(3)) (7), PdL(2) (8), and Pt(PEt(3))(2)[((t)BuN)(S)P(mu-N(t)Bu)(2)P(S)(N(t)Bu)] (9). The X-ray structures...

Anionic Polymerization of 1,3-Cyclohexadiene with Alkyllithium/Amine Systems. Characteristics of n-Butyllithium/N,N,N',N'-Tetramethylethylenediamine System for Living Anionic Polymerization.

Macromolecules

Natori I, Inoue S.
PMID: 9680400
Macromolecules. 1998 Jul 28;31(15):4687-94. doi: 10.1021/ma9718661.

The n-butyllithium (n-BuLi)/N,N,N',N'-tetramethylethylenediamine (TMEDA) system (with the molar ratio of TMEDA to n-BuLi higher than 4/4) has been found to polymerize 1,3-cyclohexadiene to produce "living" polymer having a narrow molecular weight distribution with well-controlled polymer chain length. The rate...

Low (Sub-1-volt) halfwave voltage polymeric electro-optic modulators achieved by controlling chromophore shape.

Science (New York, N.Y.)

Shi Y, Zhang C, Zhang H, Bechtel JH, Dalton LR, Robinson BH, Steier WH.
PMID: 10753112
Science. 2000 Apr 07;288(5463):119-22. doi: 10.1126/science.288.5463.119.

Electro-optic (EO) modulators encode electrical signals onto fiber optic transmissions. High drive voltages limit gain and noise levels. Typical polymeric and lithium niobate modulators operate with halfwave voltages of 5 volts. Sterically modified organic chromophores have been used to...

Behavioural effects of NKH-477, a forskolin analogue, on locomotion and rearing in rats.

The international journal of neuropsychopharmacology

Kofman O, Bersudsky Y.
PMID: 11343575
Int J Neuropsychopharmacol. 2000 Mar;3(1):27-33. doi: 10.1017/S146114579900173X.

NKH-477 is a water-soluble analogue of forskolin that stimulates adenylate cyclase and has antidepressant properties in the forced swim model of depression. The effect of chronic NKH-477 on locomotion and rearing and its behavioural interaction with lithium and inositol...

Editorial.

Methods (San Diego, Calif.)

Linthicum DS, Subramaniam S.
PMID: 10694449
Methods. 2000 Mar;20(3):265-6. doi: 10.1006/meth.1999.0920.

No abstract available.

A Study of factors affecting alpha-(N-carbamoyl)alkylcuprate chemistry.

The Journal of organic chemistry

Dieter RK, Topping CM, Nice LE.
PMID: 11281770
J Org Chem. 2001 Apr 06;66(7):2302-11. doi: 10.1021/jo0056702.

The effect of Cu(I) salt (i.e., CuCN, CuCN.2LiCl, CuI), cuprate reagent, sec-butyllithium quality, solvent, and temperature upon the chemical yields obtained in the reactions of alpha-(N-carbamoyl)alkylcuprates [i.e., N-Boc-protected alpha-aminoalkylcuprates] with (E)1-iodo-1-hexene, 5,5-dimethyl-2-cyclohexenone, methylvinyl ketone, crotonate esters, and an acid...

DFT study of the effect of sigma-ligands on the structure of ester enolates in THF, as models of the active center in the anionic polymerization of methyl methacrylate.

Journal of the American Chemical Society

Yakimansky AV, Müller AH.
PMID: 11457320
J Am Chem Soc. 2001 May 30;123(21):4932-7. doi: 10.1021/ja002865i.

A Density Functional Theory (DFT) study was carried out on structures of the lithium ester enolate of methyl isobutyrate (MIB-Li) in THF solution, in the presence of TMEDA, dimethoxyethane (DME), crown ether 12-crown-4, and cryptand-2,1,1, as electron donor ligands...

Rearrangements in the reduction of 3-iodobicyclo[1.1.1]pentyl azide with lithium aluminum hydride: mechanistic evidence of intermediates.

The Journal of organic chemistry

Hossain MT, Timberlake JW.
PMID: 11397185
J Org Chem. 2001 Jun 15;66(12):4409-12. doi: 10.1021/jo001510e.

No abstract available.

Asymmetric synthesis of axially chiral benzamides and anilides by enantiotopic lithiation of prochiral arene chromium complexes.

The Journal of organic chemistry

Koide H, Hata T, Uemura M.
PMID: 11895413
J Org Chem. 2002 Mar 22;67(6):1929-35. doi: 10.1021/jo011052p.

Axially chiral benzamides and anilides were prepared by enantiotopic lithiation at the distinguished benzylic methyl of prochiral tricarbonylchromium complexes of N,N-diethyl 2,6-dimethylbenzamide (1) and N-methyl-N-acyl 2,6-dimethylaniline (14 and 21) with a chiral lithium amide base followed by electrophilic substitution...

Showing 9985 to 9996 of 22319 entries