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Showing 25 to 36 of 556 entries
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Transformation of arylmethylamines into alpha-aminophosphonic acids via metalated phosphoramidates: rearrangement of partly configurationally stable N-phosphorylated alpha-aminocarbanions.

The Journal of organic chemistry

Hammerschmidt F, Hanbauer M.
PMID: 10987948
J Org Chem. 2000 Sep 22;65(19):6121-31. doi: 10.1021/jo000585f.

N-Benzyl phosphoramidate was protected at nitrogen with a TMS, p-toluenesulfonyl, Boc, lithium carboxylate, or diethoxyphosphinyl group and metalated with s-BuLi or LDA at -78 degrees C at the benzylic carbon. For the latter three protecting groups, the intermediate alpha-amino(phenylmethyl)lithiums...

Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability.

Environmental and experimental botany

Falkengren-Grerup U, Månsson KF, Olsson MO.
PMID: 11064041
Environ Exp Bot. 2000 Nov 01;44(3):207-219. doi: 10.1016/s0098-8472(00)00068-x.

Uptake capacity of organic nitrogen was studied in solution experiments on eight grasses and two forbs growing in acid soils with relatively high nitrogen mineralisation in southern Sweden. Uptake of a mixture of amino acids (alanine, glutamine, glycine), that...

A Novel Pentadentate Coordination Mode for the Carbonato Bridge: Synthesis, Crystal Structure, and Magnetic Behavior of (&mgr;(3)-CO(3))[Ni(3)(Medpt)(3)(NCS)(4)], a New Trinuclear Nickel(II) Carbonato-Bridged Complex with Strong Antiferromagnetic Coupling.

Inorganic chemistry

Escuer A, Vicente R, Kumar SB, Solans X, Font-Bardía M, Caneschi A.
PMID: 11666503
Inorg Chem. 1996 May 22;35(11):3094-3098. doi: 10.1021/ic9514105.

The trinuclear complex (&mgr;(3)-CO(3))[Ni(3)(Medpt)(3)(NCS)(4)] was obtained by reaction of basic solutions of nickel(II), Medpt (bis(3aminopropyl)methylamine) and thiocyanate ligand with atmospheric CO(2) or by simple reaction with carbonate anion. (&mgr;(3)-CO(3))[Ni(3)(Medpt)(3)(NCS)(4)] crystallizes in the triclinic system, space group P&onemacr;, with a...

N-(ferrocenylmethyl)-N-methylaminocyclotriphosphazenes.

Inorganic chemistry

Myer CN, Allen CW.
PMID: 11782144
Inorg Chem. 2002 Jan 14;41(1):60-6. doi: 10.1021/ic011049o.

The reactions of N-(ferrocenylmethyl)-N-methylamine, C(5)H(5)FeC(5)H(4)CH(2)(Me)NH, with hexachlorocyclotriphosphazene, N(3)P(3)Cl(6), led to the formation of the N-(ferrocenylmethyl)-N-methylaminocyclotriphosphazene derivatives, N(3)(-)P(3)Cl(6-n)[N(Me)CH(2)C(5)H(4)FeC(5)H(5)](n) (n = 1-3). Only small amounts of higher degrees of substitution could be detected. In the case of the disubstituted products, the...

Synthesis, Characterization, and Reactivity of Urea Derivatives Coordinated to Cobalt(III). Possible Relevance to Urease.

Inorganic chemistry

Roecker L, Akande J, Elam LN, Gauga I, Helton BW, Prewitt MC, Sargeson AM, Swango JH, Willis AC, Xin T, Xu J.
PMID: 11670912
Inorg Chem. 1999 Mar 22;38(6):1269-1275. doi: 10.1021/ic980287p.

The syntheses of a cobalt(III) complex, 2, containing N-(2-pyridylmethyl)urea and of six complexes, 3, containing phenyl-substituted N-2-pyridylmethyl-N'-(X)phenylureas (where X = 4-H, 4-CH(3), 4-Br, 3-Cl, 4-CF(3), and 4-NO(2)), have been accomplished by reaction of [(en)(2)Co(OSO(2)CF(3))(2)](CF(3)SO(3)) with the urea ligands in...

Effects of heavy metals on nitrogen uptake by Paxillus involutus and mycorrhizal birch seedlings.

FEMS microbiology ecology

Blaudez D, Botton B, Chalot M.
PMID: 10922504
FEMS Microbiol Ecol. 2000 Jul 01;33(1):61-67. doi: 10.1111/j.1574-6941.2000.tb00727.x.

The effects of the heavy metals Cu, Cd, Ni, Pb and Zn on [(14)C]methylamine and [(14)C]aminoisobutyric acid uptake were studied in the free-living fungus Paxillus involutus and in mycorrhizal and non-mycorrhizal birch roots. The uptake of both N sources...

A luminescent heterometallic dirhodium-silver chain.

Inorganic chemistry

Heyduk AF, Krodel DJ, Meyer EE, Nocera DG.
PMID: 11849060
Inorg Chem. 2002 Feb 25;41(4):634-6. doi: 10.1021/ic015562d.

A novel one-dimensional (1D) heterometallic chain, [[Rh(2)(dfpma)(2)(MeCN)(4)](2)[Ag(MeCN)(4)]][PF(6)](5) (1), is afforded from the in situ reaction of [ClRh(cod)](2) with [Ag(MeCN)(4)][PF(6)] and dfpma (dfpma = bis(difluorophosphine)methylamine). Dichroic crystals, which are obtained from MeCN/Et(2)O solutions, crystallize in the monoclinic space group C2/m...

A fluorescence detection scheme for capillary electrophoresis of N-methylcarbamates with on-column thermal decomposition and derivatization.

Analytical chemistry

Wu YS, Lee HK, Li SF.
PMID: 10763238
Anal Chem. 2000 Apr 01;72(7):1441-7. doi: 10.1021/ac990928d.

This paper describes a fluorescence detection method for N-methylcarbamate (NMC) pesticides in micellar electrokinetic chromatography (MEKC) separation. Fulfillment of the fluorescence detection hinged on the discovery that quaternary ammonium surfactants (particularly cetyltrimethylammonium bromide, CTAB), besides serving as hydrophobic pseudophases...

Reactivity of 2-halo-2H-azirines. 1. Reactions with nucleophiles.

The Journal of organic chemistry

Pinho e Melo TM, Lopes CS, Gonsalves AM, Beja AM, Paixão JA, Silva MR, da Veiga LA.
PMID: 11777440
J Org Chem. 2002 Jan 11;67(1):66-71. doi: 10.1021/jo010504v.

Nucleophilic substitution reactions of 2-halo-2H-azirines 1a, 1b, 1d, and 1e with potassium phthalimide and aniline allowed the preparation of new substituted 2H-azirines 2-5. The reactions of 2-bromo-2H-azirine 1a with methylamine led to the synthesis of alpha-diimines 7 and 8....

Alpha2-Macroglobulin Modulates Interactions between Lymphocytes and Fibroblasts.

Russian journal of immunology : RJI : official journal of Russian Society of Immunology

Yarovinsky TO, Gorlina NK, Cheredeev AN, Kozlov IG, Zorin NA, Zorina RM.
PMID: 12687201
Russ J Immunol. 2001 Apr;6(1):1-8.

The aim of the present study was to evaluate the influence of apha2-macroglobulin (alpha(2)M) on lymphocyte adhesion to fibroblasts. Peripheral blood lymphocytes from healthy donors and two fibroblast lines (human diploid embryo fibroblasts M-19 and mouse transformed fibroblasts L929)...

New electron-deficient chiral phosphines: (4R,5R)-1,3-bis(trifluoromethanesulfonyl)perhydro-1,3,2-benzodiazaphosphol-2-yl] substituted amines.

Acta crystallographica. Section C, Crystal structure communications

Konya D, Philouze C, Gimbert Y, Greene AE.
PMID: 11828125
Acta Crystallogr C. 2002 Feb;58:o108-11. doi: 10.1107/s0108270101018200. Epub 2002 Jan 23.

Three chiral electron-deficient phosphine ligands, [(4R,15R)-,3-bis(trifluoromethanesulfonyl)perhydro-1,3,2-benzodiazaphosphol-2-yl]diethylamine, C(12)H(20)F(6)N(3)O(4)PS(2), (IIIa), [(4R,5R)-1,3-bis(trifluoromethanesulfonyl)perhydro-1,3,2-benzodiazaphosphol-2-yl]dimethylamine, C(10)H(16)F(6)N(3)O(4)PS(2), (IIIb), and bis[(4R,5R)-1,3-bis(trifluoromethanesulfonyl)perhydro-1,3,2-benzodiazaphosphol-2-yl]methylamine, (IV), as the chloroform solvate, C(17)H(23)F(12)N(5)O(8)P(2)S(4).0.98CHCl(3), have been prepared from (1R,2R)-N,N'-bis(trifluoromethanesulfonyl)-1,2-cyclohexanediamine and diethyl phosphoramidous dichloride, dimethyl phosphoramidous dichloride or methyl imidodiphosphorus tetrachloride. The pi-acceptor abilities of...

Model Studies of TTQ-Containing Amine Dehydrogenases.

The Journal of organic chemistry

Itoh S, Takada N, Haranou S, Ando T, Komatsu M, Ohshiro Y, Fukuzumi S.
PMID: 11667879
J Org Chem. 1996 Dec 13;61(25):8967-8974. doi: 10.1021/jo961705f.

The reactions of a TTQ model compound [1, 3-methyl-4-(3'-methylindol-2'-yl)indole-6,7-dione] with several amines have been investigated in organic media to obtain mechanistic information on the action of quinoprotein methylamine and aromatic amine dehydrogenases. It has been found that compound 1...

Showing 25 to 36 of 556 entries