The use of O-methyl-N-(α-methylbenzyl)hydroxylamine as a novel chiral auxiliary in asymmetric ortho-deprotonation of the (η6-arene) chromium tricarbonyl complexes is described. Upon quenching of the resultant ortho-lithiated complex with an electrophile, 1,2-disubstituted (η6-arene) chromium ...

(Aryl aldehyde)- and (aryl ketone)-chromium tricarbonyl complexes ortho-substituted with the chiral auxiliary O-methyl-N-(α-methylbenzyl)hydroxylamine undergo diastereoselective addition of Grignard reagents and Super-Hydride®, respectively, to give the corresponding secondary alcohols in high ...

In this study, the structural distortion of graphitic carbon nitride (g-C3N4) has been done through potassium salt tempting towards an extended optical absorbance. Optical and morphological studies affirm that the potassium doping stimulate n − π∗ electronic transition ascribing towards a dimin...

The reactions of pyridine-2-carbaldimines, py-2- CHNR (R = C6H4OMe-p, Me), with allylic dimers [MCl(n3-2-MeC3H4)]2 give rise to stoichiometry, concentration, solvent and temperature dependent equilibria, in which the cationic complexes [M(n3- 2-MeC3H4)(py-2-CHNR)]+ and the anion [MCl2(n3- 2-...

Optically active ligands of type Ph2PNHR (R = (R)-CHCH3Ph, (a); (R)-CHCH3Cy, (b); (R)-CHCH3Naph, (c)) and PhP(NHR)2 (R = (R)-CHCH3Ph, (d); (R)-CHCH3Cy, (e)) with a stereogenic carbon atom in the R substituent were synthesized. Reaction with [PdCl2(COD)2] produced [PdCl2P2] (1) (P = PhP(NHCHCH3Ph...

[RhCl(PF3)2]2 (II) reacts with diphenylacetylene to give the tetraphenylcyclobutadiene complex [RhCl(C4Ph4)]2, which on treatment with thallium salts TlR (R = π-C5H5, acac, facac), afford good yields of Rh(π-C5H5)(C4Ph4), Rh(acac)(C4Ph4), and Rh(facac)(C4Ph4) respectively. The reactions of II ...

Chloro- and bromo-(alkene)iridium(I) complexes were prepared by the reaction of monoenes, acyclic conjugated dienes, and cyclic polyenes with the cyclooctene complexes IrX(C3H14)2 with X = Cl or Br.IrCl(C2H4)4 is an unstable penta-coordinated compound from which the planar chlorine-bridged dimer...

The chlorobis(ethylene)iridium(I) dimer, [IrCl(C2H4)2]2 and acetylacetonatobis(ethylene)iridium(I), Ir(acac)(C2H4)2, react with C2F4 to give mixed ethylenetetrafluoroethylene complexes, in which the ethylene ligand may be replaced by alkenes such as cyclooctene and 1,5-cyclooctadiene. A number o...

This paper describes the synthesis and characterization of a series of rhodium(I) and rhodium(III) complexes containing tellurium-rhodium bonds resulting from the coordination of diorgano telluride or organotelluro ligands. Oxidative addition, metathesis and substitution reactions of these compo...

The proton spin-lattice relaxation behaviour of solid chloro-tetrakis(ethylene)iridium(I) has been investigated liquid nitrogen and room temperature.The results can be explained by 180°-flip reorientations about the metal axes. The activation energy determining the reorientation of the axial et...

Several rhodium(I) complexes containing chiral phosphine, (+) DIOP, (+) BINAP, (S,S) CHIRAPHOS, and (S)(R) BPPFA, have been found to be effective as catalyst for the asymmetric hydroboration of prochiral alkenes with catecholborane (1,3,2-benzodioxaborole) to give optically active 2-alkyl-l,3,2-...

A series of heterogenized catalysts has been prepared by the reaction of chlorobis(ethylene)rhodium(I) dimer and phosphinated silica. The structures of these catalysts have been varied by changing the length of the phosphine-alkylene chain, -(CH2)nPPh2, used to couple the rhodium center to the s...

The synthesis and properties of chlorobis(triphenylphospine)iridium(I), IrCl(PPh3)2, and some of its addition products are reported.With ethylene, IrCl(C2H4)(PPh3)2 is formed. Indications have been found pointing to the formation, at low temperature, of the unstable bis(ethylene) adduct IrCl(C2H...

The structure of chlorobis(tricyclohexylphosphine) (sulfur dioxide)rhodium(I) has been determined by single crystal X-ray techniques. The complex crystallizes in the space group P21/c with cell constants of a = 13.371(6), b = 12.783(6), c = 23.293(10) Å and β = 105.01(2)°. Refinements using 28...

Diorganotin(IV) complexes, [SnR2L] (1)–(4), (R = Me, Ph), of the terdentate Schiff bases N-[(2-pyrroyl)methylidene]-N′-tosylbenzene-1,2-diamine (H2L1) and N-[(2-hydroxyphenyl)metylidene]-N′-tosylbenzene-1,2-diamine (H2L2) have been synthesised. The complexes were obtained by addition of the a...

The reactions of organoiron sulfanes (μ-Sx)[FeCp(CO)2]2 (x = 3, 4) with acid chlorides, RCOCl, produce the new organoiron thiocarboxylates, FeCp(CO)2SCOR, where R = 2-CH3C6H4, I; R = 2-CH3COOC6H4, II; R = 3,5-(O2N)2C6H3, III; R = 2-O2NC6H4, IV and R = 2-FC6H4, V. The organoiron, thioterephthala...

A method based on solid-phase microextraction with capillary gas chromatography and microwave-induced plasma atomic emission detection (SPME-GC-MIP-AED) for the determination of cyclopentadienylmanganese tricarbonyl (CMT) and its methyl derivative, (methylcyclopentadienyl)manganese tricarbonyl (...

BackgroundN-acetylglutamate synthase (NAGS) plays a key role in the removal of ammonia via the urea cycle by catalyzing the synthesis of N-acetylglutamate (NAG), the obligatory cofactor in the carbamyl phosphate synthetase 1 reaction. Enzymatic analysis of NAGS in liver homogenates has remained ...

Tailored compounds, based on alkyl-substituted derivatives of succinic anhydride, acid and dipotassium salt have been used to evaluate their role for intercalation of montmorillonite (MMT) and the formation of nanocomposites based on polyethylene (PE) in the presence of maleic anhydride grafted ...

The synthesis and the kinetics of the synthesis of d4-succinic anhydride from succinic anhydride and d1-acetic acid, catalyzed by sodium acetate, are presented. The results show that the conversion is both base and solvent catalyzed, suggesting that the deuteration may occur through the enolizat...