scholarly journals Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

2010 ◽  
Vol 8 (1) ◽  
pp. 229-240 ◽  
Author(s):  
Manisekar Muthukumar ◽  
Periasamy Viswanathamurthi
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Secondary Alcohols ◽  
Octahedral Structure ◽  
Imine Nitrogen ◽  
Phenolic Oxygen ◽  
Thiosemicarbazone Complexes ◽  
Aldehydes And Ketones ◽  
Nmr Methods

AbstractA series of new hexa-coordinated ruthenium(II) complexes of the type [Ru(CO)(EPh3)(B)(L)] (E = P or As; B = PPh3, AsPh3 or Py; L = chalcone thiosemicarbazone) have been prepared by reacting [RuHCl(CO)(EPh3)2(B)] (E = P or As; B = PPh3, AsPh3 or Py) with chalcone thiosemicarbazones in benzene under reflux. The new complexes have been characterized by analytical and spectroscopic (IR, UV-vis, 1H, 31P and 13C NMR) methods. On the basis of data obtained, an octahedral structure was assigned for all of the complexes. The chalcone thiosemicarbazones behave as dianionic tridentate O, N, S donors and coordinate to ruthenium via the phenolic oxygen of chalcone, the imine nitrogen of thiosemicarbazone and thienol sulfur. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones and they were also found to be efficient catalysts for the transfer hydrogenation of carbonyl compounds.

Hydrogen transfer reactions. I. Reduction of carbonyl compounds by alcohols catalyzed by alumina

1969 ◽  
Vol 47 (19) ◽  
pp. 3705-3707 ◽  
Author(s):  
D. V. Ramana ◽  
C. N. Pillai
Keyword(s):  
Vapor Phase ◽  
Carbonyl Compounds ◽  
Hydrogen Transfer ◽  
Isopropyl Alcohol ◽  
Aromatic Aldehydes ◽  
Transfer Reactions ◽  
Secondary Alcohols ◽  
Effective Catalyst ◽  
Phase Reduction ◽  
Aldehydes And Ketones

Alumina containing about 2.2% by weight of Na+ has been found to be an effective catalyst for the vapor phase reduction of carbonyl compounds by alcohols and for the reverse reaction, the oxidation of the alcohols by carbonyl compounds. The reduction of a number of aliphatic and aromatic aldehydes and ketones by isopropyl alcohol and the oxidation of a number of primary and secondary alcohols by ketones like acetone and cyclohexanone are reported.

scholarly journals {1-[1-(2-Hydroxyphenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}{1-[1-(2-oxidophenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}nickelate(II) nitrate hemihydrate

2018 ◽  
Vol 74 (5) ◽  
pp. 642-645 ◽  
Author(s):  
Sarr Mamour ◽  
Diop Mayoro ◽  
Thiam Elhadj Ibrahima ◽  
Gaye Mohamed ◽  
Barry Aliou Hamady ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Hydrogen Bonds ◽  
Oxygen Atom ◽  
Carbonyl Compounds ◽  
Three Dimensional ◽  
Optical Isomers ◽  
Imine Nitrogen ◽  
Phenolic Oxygen ◽  
Imine Nitrogen Atom ◽  
Nitrate Anions

The 2-hydrazinopyridine precursor has been widely used to prepare ligands of various kinds by condensation with carbonyl compounds. These types of ligands are suitable for synthesizing novel transition metal (II) complexes with interesting magnetic properties. In this context we have synthesized the ligand 1-(2-hydroxyphenyl-2-ethylidene)-2-(pyridin-2-yl)hydrazine (HL) which was used in the preparation of the mononuclear title complex, [Ni(C13H12N3O)(C13H13N3O)]NO3·0.5H2O. As a result of the presence of HL and L in the [{Ni(HL)(L)}]+ unit, the complex appears to be a supramolecular dimer composed of the Δ(−) and Λ(−) optical isomers, which are linked by strong hydrogen-bonds. As well as the dimer generated by two mononuclear [{Ni(HL)(L)}]+ cations, the asymmetric unit also contains two nitrate anions and one water molecule. Each Ni atom is coordinated to two ligand molecules by a nitrogen atom of the pyridine ring, an imine nitrogen atom and a phenolic oxygen atom of one of the ligand molecules and a phenolate oxygen atom of the other organic molecules. The environment around the cation is a distorted octahedron. The basal planes are defined by the two nitrogen atoms of the pyridine rings and the two phenolic oxygen atoms of the ligand, the apical positions being occupied by the azomethine atoms. The O atoms of one of the nitrate ions are disordered over two sets of sites in a 0.745 (9):0.255 (9) ratio. In the crystal, the dimers are linked by numerous hydrogen bonds, forming a three-dimensional framework.

scholarly journals Syntheses, characterisation, and catalytic role of (η5-C5Me5)Rh(iii) guanidinato complexes in transfer hydrogenation (TH) and TH–etherification

RSC Advances ◽  
2017 ◽  
Vol 7 (54) ◽  
pp. 33890-33904 ◽  
Author(s):  
Robin Kumar ◽  
Natesan Thirupathi
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Catalytic Role

Complex 3 has been synthesised and its catalytic activity in base assisted and base free transfer hydrogenation (TH) of a variety of carbonyl compounds and TH–etherification of substrates such as 2-hydroxy-1-naphthaldehyde have been achieved.

Metal-catalysed selective transfer hydrogenation of α,β-unsaturated carbonyl compounds to allylic alcohols

2020 ◽  
Vol 22 (11) ◽  
pp. 3323-3357 ◽  
Author(s):  
Ronald A. Farrar-Tobar ◽  
Andrea Dell'Acqua ◽  
Sergey Tin ◽  
Johannes G. de Vries
Keyword(s):  
Carbonyl Compounds ◽  
State Of The Art ◽  
The State ◽  
Transfer Hydrogenation ◽  
Allylic Alcohols ◽  
Selective Transfer ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
Metal Catalyzed

This review describes the state-of-the-art of metal-catalyzed selective transfer hydrogenation of α,β-unsaturated aldehydes and ketones to the allylic alcohols, covering the literature of the last 30 years.

scholarly journals Mechanically induced oxidation of alcohols to aldehydes and ketones in ambient air: Revisiting TEMPO-assisted oxidations

2017 ◽  
Vol 13 ◽  
pp. 2049-2055 ◽  
Author(s):  
Andrea Porcheddu ◽  
Evelina Colacino ◽  
Giancarlo Cravotto ◽  
Francesco Delogu ◽  
Lidia De Luca
Keyword(s):  
Ball Milling ◽  
Carboxylic Acids ◽  
Carbonyl Compounds ◽  
Ambient Air ◽  
Mechanochemical Reaction ◽  
Secondary Alcohols ◽  
Mechanical Processing ◽  
Oxidation Of Alcohols ◽  
Aldehydes And Ketones ◽  
Cost Efficient

The present work addresses the development of an eco-friendly and cost-efficient protocol for the oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones by mechanical processing under air. Ball milling was shown to promote the quantitative conversion of a broad set of alcohols into carbonyl compounds with no trace of an over-oxidation to carboxylic acids. The mechanochemical reaction exhibited higher yields and rates than the classical, homogeneous, TEMPO-based oxidation.

Application of Dess-Martin oxidation in total synthesis of natural products

2020 ◽  
Vol 17 ◽  
Author(s):  
Majid M. Heravi ◽  
Tayebe Momeni ◽  
Vahideh Zadsirjan ◽  
Leila Mohammadi
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Selective Oxidation ◽  
Secondary Alcohols ◽  
Aldehydes And Ketones

: Dess–Martin periodinane (DMP), is a commercially available chemical, frequently being utilized as a mild oxidative agent for the selective oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones, respectively. DMP shows several merits over other common oxidative agent such as chromium- and DMSO-based oxidants, thus it is habitually employed in the total synthesis of natural products. In this review, we try to underscore the applications of DMP as an effective oxidant in an appropriate step (steps) in the multistep total synthesis of natural products.

scholarly journals Copper(I) Chloride/Kieselguhr: A Versatile Catalyst for Oxidation of Alkyl Halides and Alkyl Tosylates to the Carbonyl Compounds

1999 ◽  
Vol 23 (7) ◽  
pp. 434-435
Author(s):  
Mohammed M. Hashemi ◽  
Yousef Ahmadi Beni
Keyword(s):  
Carbonyl Compounds ◽  
Alkyl Halides ◽  
Aldehydes And Ketones ◽  
High Yields

Copper(I) Chloride adsorbed on Kieselguhr in the presence of oxygen catalyses oxidation of alkyl halides and alkyl tosylates to the aldehydes and ketones in high yields.

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