- Benzylic imidazolidinium, 3,4,5,6-tetrahydropyrimidinium and benzimidazolium salts: Applications in ruthenium-catalyzed allylic substitution reactions
-
Imidazolidinium, tetrahydropyrimidinium and benzimidazolium salts were prepared. Upon reaction with tBuOK, they generate carbene ligands, which were associated in situ to [RuCp*(MeCN)3]PF6 to produce ruthenium catalysts that are acti
- Yasar, Sedat,Oezdemir, Ismail,Cetinkaya, Bekir,Renaud, Jean-Luc,Bruneau, Christian
-
scheme or table
p. 2142 - 2149
(2009/04/04)
-
- Synthesis, antiinflammatory and analgesic activity of new hexahydropyrimidine derivatives
-
A number of potentially active hexahydropyrimidine derivatives of pharmaceutical interest have been synthesized. Various diSchiff's bases prepared by reacting different aromatic aldehydes with 1,3-diaminopropane were suitably reduced to give their tetrahy
- Khan,Gupta
-
p. 377 - 383
(2007/10/03)
-
- O2 activation and aromatic hydroxylation performed by diiron complexes
-
Chemical models of active sites of diiron oxo proteins have been synthesized. The polydendate ligands are EDTA derivatives which provide a balanced supply of nitrogen atoms and carboxylate groups together with an oxidizable phenyl moiety, thus mimicking both the iron coordination in methane monooxygenase and a nearby substrate site. All the diferric complexes have been characterized in solution by ESI-MS, optical absorption, and in some cases by 1H NMR. In the case of the ligand L1 [L1 = (N,N'-bis(3,4,5- trimethoxybenzyl)ethylenediamine N,N'-diacetic acid)], the X-ray structure of the corresponding iron complex has been determined, revealing an original tetranuclear unit, Fe4O2(L1)4·10H2O, issued from the dimerization of two [Fe2O(L1)2] units linked by carboxylate bridges. In a solution containing water or acetate, the tetranuclear complex decomposed into dinuclear complexes, which proved to be able to react with hydrogen peroxide or dioxygen in the presence of ascorbate. The final product was a mononuclear complex identified as [Fe(III)L'1(H2O)] with L'1 resulting from the quantitative hydroxylation of L1. The complex and the oxidized ligand were characterized by EPR, NMR, and UV-vis spectroscopies and by mass spectrometry. Labeling experiments showed that with both H2O2 or O2 and ascorbate, the incorporated oxygen came from the oxidant exclusively. This reaction mimicks the transformation of a tyrosine residue, brought into proximity of the active center of Ribonucleotide reductase of Escherichia coli by site-directed mutagenesis, into 3,4-dihydroxyphenylalanine.
- Ménage, Stéphane,Galey, Jean-Baptiste,Dumats, Jacqueline,Hussler, Georges,Seité, Michel,Luneau, Isabelle Gautier,Chottard, Geneviève,Fontecave, Marc
-
p. 13370 - 13382
(2007/10/03)
-
- SYNTHESIS OF N,N'-DIARALKYL-2H-1,2,6-TETRAHYDROTHIADIAZINES
-
Several derivatives of the 2H-1,2,6-tetrahydrothiadiazine ring system have been synthesized by the interaction of the sulfur transfer reagent N,N-thiobisphthalimide (TBP) with appopriately substituted N,N'-bis-(benzyl)-1,3-diaminopropanes.
- Meisenheimer, John L.,Meisenheimer, John L.,Raya, Diana G.,Stapleton, Michael C.,Goddard, Carl J.
-
p. 2229 - 2236
(2007/10/02)
-