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Full-Text Articles in Physical Sciences and Mathematics
An Efficient Ligand-Free Method For The Transfer Hydrogenation Of Ketones And Aldehydes Catalyzed By Different Complexes, Sedat Yaşar, Suzan Çeki̇rdek, Ni̇lay Akkuş Taş, Semi̇ha Yildirim, İsmai̇l Özdemi̇r
An Efficient Ligand-Free Method For The Transfer Hydrogenation Of Ketones And Aldehydes Catalyzed By Different Complexes, Sedat Yaşar, Suzan Çeki̇rdek, Ni̇lay Akkuş Taş, Semi̇ha Yildirim, İsmai̇l Özdemi̇r
Turkish Journal of Chemistry
A very efficient ligand-free method was developed for the transfer hydrogenation of ketones and aldehydes catalyzed by different metal complexes. With this catalytic system, the catalytic performance and catalytic stability of different Ir, Ru, and Pd complexes were more favorable than those of the previously reported systems for transfer hydrogenation. This ligand-free catalytic system showed good stability and excellent activity even with lower catalyst concentrations for the ketones and aldehydes tested.
(Nhc)-Pd(Ii) Complexes With Hydrophilic Nitrogen Ligands: Catalytic Properties In Neat Water, Hayati̇ Türkmen, Lütfi̇ye Gök, İbrahi̇m Kani̇, Beki̇r Çeti̇nkaya
(Nhc)-Pd(Ii) Complexes With Hydrophilic Nitrogen Ligands: Catalytic Properties In Neat Water, Hayati̇ Türkmen, Lütfi̇ye Gök, İbrahi̇m Kani̇, Beki̇r Çeti̇nkaya
Turkish Journal of Chemistry
The cleavage reactions of the dimers [(NHC)PdX_2]_2 with hydrophilic N-donors, L, afforded the mixed-ligand complexes of the type trans-[(NHC)LPdX_2] (X = Cl or Br; NHC = 1,3-dialkylbenzimidazol-2-ylidene (BIm) or bis(imino)acenaphthene-annulated bis(2,6-diisopropylphenyl)imidazol-2-ylidene (BIAN-IPr); L = diethanolamine (DEA), morpholine (MOR), and 3-pyridinecarboxylic acid (3-PCA)). The new complexes (1--3) were characterized by elemental analysis and spectroscopic methods and the molecular structure of 1a was determined by X-ray diffraction studies. These complexes were applied in the Suzuki--Miyaura cross-coupling reaction of phenylboronic acid with aryl halides in neat water. The activities of catalysts were monitored by gas chromatography--flame ionization detector and nuclear magnetic resonance. Whereas …
Ultrasound-Assisted Emulsification--Solidified Floating Organic Drop Microextraction Combined With Flow Injection--Flame Atomic Absorption Spectrometry For The Determination Of Palladium In Water Samples, Shayessteh Dadfarnia, Ali Mohammad Haji Shabani, Mooud Amirkavei
Ultrasound-Assisted Emulsification--Solidified Floating Organic Drop Microextraction Combined With Flow Injection--Flame Atomic Absorption Spectrometry For The Determination Of Palladium In Water Samples, Shayessteh Dadfarnia, Ali Mohammad Haji Shabani, Mooud Amirkavei
Turkish Journal of Chemistry
The ultrasound-assisted emulsification--solidified floating organic drop microextraction (USAE--SFODME) methodology was combined with flow injection--lame atomic absorption spectrometry (FI--FAAS) for the separation/pre\-concentration and determination of palladium at ultratrace level. In this method, the palladium ion in the aqueous solution was complexed with acetylacetone (6 \times 10^{-3} mol L^{-1}) in the pH range of 1--7 and was extracted into 40 \mu L of 1-undecanol, which was sonically dispersed in the aqueous phase. The vial was then centrifuged and cooled in an ice bath for 5 min. The solidified extract was melted and diluted to 100 \mu L with a solution of hydrochloric …
Palladium-Edta And Palladium-Edteh_4 Catalyzed Heck Coupling Reactions In Pure Water, Süleyman Gülcemal, Beki̇r Çeti̇nkaya
Palladium-Edta And Palladium-Edteh_4 Catalyzed Heck Coupling Reactions In Pure Water, Süleyman Gülcemal, Beki̇r Çeti̇nkaya
Turkish Journal of Chemistry
Palladium-catalyzed Heck coupling reactions of styrene with bromoarene derivatives are carried out under aerobic conditions in water using water-soluble N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (EdteH_4) and ethylenediaminetetraacetic acid disodium salt (Na_2EDTA) as ligands. The effect of different bases, catalyst loading, and additives is also monitored. The olefination of bromoarenes with styrene affords the desired products in high yields. The Na_2PdCl_4-Na_2EDTA precatalyst system is also used for the preparative scale (50.0 mmol) synthesis of 4-acetyl-trans-stilbene and 4-styrylbenzaldehyde without a noticeable decrease in the activity. Recycling studies on the Na_2PdCl_4 - Na_2EDTA precatalyst system are also tested in the coupling of 4-bromoacetophenone with styrene.