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At least 163 records · Page 9Linked to original sources
PubMed1998

Oxidation of Complexes by (O(2)CPh)(2) and (ER)(2) (E = S, Se), Including Structures of Pd(CH(2)CH(2)CH(2)CH(2))(SePh)(2)(bpy) (bpy = 2,2'-Bipyridine) and MMe(2)(SePh)(2)(L(2)) (M = Pd, Pt; L(2) = bpy, 1,10-Phenanthroline) and C.O and C.E Bond Formation at Palladium(IV).

Oxidation of PdMe(2)(L(2)) [L(2) = 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen)] by diphenyl diselenide provides the first examples of stable dimethylpalladium(IV) complexes PdMe(2)(SePh)(2)(L(2)), and pallada(IV)cyclic may be similarly isolated. X-ray structural studies of the octahedral dimethylpalladium(IV) complexes and their isomorphous platinum(IV) analogues have been completed [L(2) = bpy, orthorhombic Pnma; L(2) = phen, triclinic P&onemacr;; an additional phase for PtMe(2)(SePh)(2)(phen), tetragonal, I4(1)/a]. The complexes PdMe(2)(SePh)(2)(L(2)) decompose at moderate temperatures in CDCl(3) following first-order behavior [L(2) = bpy, E(a) approximately 46 kJ mol(-)(1), DeltaS()(20 degrees C) approximately -170 J K(-)(1) mol(-)(1); L(2) = phen, E(a) approximately 36 kJ mol(-)(1), DeltaS()(20 degrees C) approximately -204 J K(-)(1) mol(-)(1)] to give ethane and Se(Ph)Me, together with small quantities of SePh(2). Similar C.C, C.O, C.S, and C.Se bond formation processes occur on decomposition of palladium(IV) species that are too unstable to be isolated on the oxidation of PdMe(2)(bpy) or by (O(2)CPh)(2) or (SPh)(2).

Journal Article↗
PubMed2003

Preparation and NMR studies of cobalt-containing diphosphine ligand chelated W, Ru, Au and Pd complexes: Suzuki cross-coupling reactions and carbonylation catalyzed by the Pd complex.

Treatment of a cobalt-containing diphosphine ligand, [[mu-P,P-PPh2CH2PPh2]Co2(CO)4[mu-PPh2C[triple bond]CPPh2]] 1 with metal complexes W(CO)6, Ru3(CO)12, AuCl(tht)(tht = tetrahydrothiophene) and (COD)PdCl2(COD = 1,5-cycloctadiene) gave 1-chelated metal complexes [(1)W(CO)4], [(mu-1)Ru3(CO)10] 4, [(1)(AuCl)2] 5 and [(1)PdCl2] 6, respectively. All these compounds were characterized by spectroscopic means whereas 3, 4 and 6 were also studied by X-ray diffraction. These compounds display chelating and bridging modes of metal-phosphine complexation. Variable-temperature 1H and 31P NMR experiments were carried out for 3-6 and revealed that the fluxional behavior of each individual bridging dppm fragment was affected greatly by the bite angle of 1 in each metal complex. Suzuki cross-coupling reactions were satisfactorily catalyzed by under mild conditions. The reactions of aryl halides or iodothiophenes with chloroform and alkali in biphasic solution utilizing a catalytic amount of result into the formation of benzoic and thiophenic acids, respectively.

Journal Article↗
PubMed2004

Sequential homobimetallic catalysis: an unprecedented tandem Pd(0)-catalysed deprotection - Pd(II)-catalysed heterocyclisation reaction leading to benzofurans.

We report here the first example of "sequential homobimetallic catalysis": a transition metal catalyst with the metal in a certain oxidation state catalyses the deprotection of a functional group, which in situ undergoes a subsequent transformation catalysed by another complex of the same metal but in a different oxidation state.

Journal Article↗