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Iodide Complexes (iodide + complex)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Allylation of Aldehydes Promoted by the Cerium(III) Chloride Heptahydrate/Sodium Iodide System: the Dependence of Regio- and Stereocontrol on the Reaction Conditions

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-13 2005
G. Bartoli
Abstract The cerium(III) chloride heptahydrate/sodium iodide complex (CeCl3,,,7,H2O/NaI) acts as a useful promoter in the carbon-carbon bond forming reaction by addition of allyltributylstannanes to aldehydes. The reaction of 2-butenyltributylstannane shows that the regio- and the stereochemical outcomes depend on the reaction conditions. When the promoter is adsorbed on a solid support (aluminum oxide), a highly prevalent formation of the ,-adduct is observed in solvent-free conditions. Conversely, when the reaction is carried out in acetonitrile as the solvent, the ,-adduct largely prevails. In the last case, a complete stereocontrol is observed, the less stable (Z)-isomer being obtained in high geometrical purity. [source]

Robust packing in cyclopalladated primary amines: isomorphous crystal structures of four complexes with varying substitution patterns

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2009
Beatrice Calmuschi-Cula
The crystal structures of (SP -4-4)-[rac -2-(1-aminoethyl)phenyl-,2C1,N]chlorido(pyridine-,N)palladium(II), [Pd(C8H10N)Cl(C5H5N)], (I), (SP -4-4)-[rac -2-(1-aminoethyl)phenyl-,2C1,N]bromido(pyridine-,N)palladium(II), [PdBr(C8H10N)(C5H5N)], (II), (SP -4-4)-[rac -2-(1-aminoethyl)-5-bromophenyl-,2C1,N]bromido(4-methylpyridine-,N)palladium(II), [PdBr(C8H9BrN)(C6H7N)], (III), and (SP -4-4)-[rac -2-(1-aminoethyl)-5-bromophenyl-,2C1,N]iodido(4-methylpyridine-,N)palladium(II), [Pd(C8H9BrN)I(C6H7N)], (IV), are reported. The latter is the first iodide complex in this class of compounds. All four complexes crystallize in the same space group, viz.I41/a, with very similar lattice parameters a and more flexible lattice parameters c. Their packing corresponds to that of their enantiomerically pure congeners, which crystallize in the t2 subgroup I41. [source]

Isomorphism in monomeric 1:3 complexes of silver(I) salts with tri- p -tolylphosphine

ACTA CRYSTALLOGRAPHICA SECTION B, Issue 6 2009
Bernard Omondi
Reaction of silver(I) salts with three equivalents of tri- p -tolylphosphine in CH3CN resulted in a series of isomorphous complexes [AgX{P(4-MeC6H4)3}3] (X = Br, SCN, ClO4). These complexes all crystallize in the orthorhombic space group Pna21. The complexes with X = Br, SCN are distorted tetrahedral around the silver(I) atom, whereas the ClO4, complex is distorted trigonal planar around the silver. The new complexes are compared with each other using r.m.s. overlay calculations as well as half-normal probability plot analysis and with the previously reported isomorphous chloride, bromide as well as the non-isomorphous iodide complexes. [source]

,-Diketiminate-Stabilized Magnesium(I) Dimers and Magnesium(II) Hydride Complexes: Synthesis, Characterization, Adduct Formation, and Reactivity Studies

CHEMISTRY - A EUROPEAN JOURNAL, Issue 3 2010
Simon
Abstract The preparation and characterization of a series of magnesium(II) iodide complexes incorporating ,-diketiminate ligands of varying steric bulk and denticity, namely, [(ArNCMe)2CH], (Ar=phenyl, (PhNacnac), mesityl (MesNacnac), or 2,6-diisopropylphenyl (Dipp, DippNacnac)), [(DippNCtBu)2CH], (tBuNacnac), and [(DippNCMe)(Me2NCH2CH2NCMe)CH], (DmedaNacnac) are reported. The complexes [(PhNacnac)MgI(OEt2)], [(MesNacnac)MgI(OEt2)], [(DmedaNacnac)MgI(OEt2)], [(MesNacnac)MgI(thf)], [(DippNacnac)MgI(thf)], [(tBuNacnac)MgI], and [(tBuNacnac)MgI(DMAP)] (DMAP=4-dimethylaminopyridine) were shown to be monomeric by X-ray crystallography. In addition, the related ,-diketiminato beryllium and calcium iodide complexes, [(MesNacnac)BeI] and [{(DippNacnac)CaI(OEt2)}2] were prepared and crystallographically characterized. The reductions of all metal(II) iodide complexes by using various reagents were attempted. In two cases these reactions led to the magnesium(I) dimers, [(MesNacnac)MgMg(MesNacnac)] and [(tBuNacnac)MgMg(tBuNacnac)]. The reduction of a 1:1 mixture of [(DippNacnac)MgI(OEt2)] and [(MesNacnac)MgI(OEt2)] with potassium gave a low yield of the crystallographically characterized complex [(DippNacnac)Mg(,-H)(,-I)Mg(MesNacnac)]. All attempts to form beryllium(I) or calcium(I) dimers by reductions of [(MesNacnac)BeI], [{(DippNacnac)CaI(OEt2)}2], or [{(tBuNacnac)CaI(thf)}2] have so far been unsuccessful. The further reactivity of the magnesium(I) complexes [(MesNacnac)MgMg(MesNacnac)] and [(tBuNacnac)MgMg(tBuNacnac)] towards a variety of Lewis bases and unsaturated organic substrates was explored. These studies led to the complexes [(MesNacnac)Mg(L)Mg(L)(MesNacnac)] (L=THF or DMAP), [(MesNacnac)Mg(,-AdN6Ad)Mg(MesNacnac)] (Ad=1-adamantyl), [(tBuNacnac)Mg(,-AdN6Ad)Mg(tBuNacnac)], and [(MesNacnac)Mg(,- tBu2N2C2O2)Mg(MesNacnac)] and revealed that, in general, the reactivity of the magnesium(I) dimers is inversely proportional to their steric bulk. The preparation and characterization of [(tBuNacnac)Mg(,-H)2Mg(tBuNacnac)] has shown the compound to have different structural and physical properties to [(tBuNacnac)MgMg(tBuNacnac)]. Treatment of the former with DMAP has given [(tBuNacnac)Mg(H)(DMAP)], the X-ray crystal structure of which disclosed it to be the first structurally authenticated terminal magnesium hydride complex. Although attempts to prepare [(MesNacnac)Mg(,-H)2Mg(MesNacnac)] were not successful, a neutron diffraction study of the corresponding magnesium(I) complex, [(MesNacnac)MgMg(MesNacnac)] confirmed that the compound is devoid of hydride ligands. [source]