Molybdenum, tungsten, and manganese carbonyl compounds incorporating novel tridentate chelating dimethyl(1-pyrazolyl)(ethanolamino)gallate ligands

1979 ◽  
Vol 57 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Kenneth S. Chong ◽  
Alan Storr
Keyword(s):  
Carbonyl Compounds ◽  
Amino Nitrogen ◽  
Chelating Ligands ◽  
Spectroscopic Measurements ◽  
Methyl Substitution ◽  
Carbonyl Derivatives ◽  
Site Preferences ◽  
Steric Factors ◽  
Manganese Carbonyl ◽  
Manganese Compounds

The coordinating properties of the tridentate tris-chelating ligand, [Me2Ga(OCH2CH2NH2)(N2C3H3)]−, and its three methyl substituted derivatives (methyl substitution on the amino nitrogen and the 3,5 positions of the pyrazolyl ring) have been studied in a series of molybdenum, tungsten, and manganese carbonyl compounds. Mixed allyl carbonyl and nitrosyl carbonyl compounds of both molybdenum and tungsten have been characterized, and a series of tricarbonyl manganese compounds studied. All the complexes are monomeric octahedral species having the tris-chelating ligands in fac coordination. Steric factors influence the arrangement of the three remaining groups in the mixed octahedral complexes (i.e. allyl carbonyl and nitrosyl carbonyl derivatives) and particular site preferences are inferred from spectroscopic measurements.

Synthesis and complexation of the novel tridentate anionic organogallate ligands, [Me2Ga(N2C5H7)(OCH2CH2SR)]− (R = Et or Ph)

1981 ◽  
Vol 59 (9) ◽  
pp. 1331-1341 ◽  
Author(s):  
Kenneth S. Chong ◽  
Alan Storr
Keyword(s):  
Carbonyl Compounds ◽  
Coordination Mode ◽  
The Novel ◽  
Steric Factors ◽  
Manganese Carbonyl

The synthesis and complexation of the novel tridentate chelating anionic organogallate ligands [Me2Ga(N2C5H7)(OCH2CH2SR)]− (R = Et or Ph) have been investigated. A variety of octahedral molybdenum, tungsten, and manganese carbonyl compounds have been studied in which the organogallate ligand (R = Et) is in the fac coordination mode. In addition tetrahedral "Cu•PPh3" and "Ni(NO)" complexes have been characterized which display fluxional behaviour in solution. The dearth of derivatives available using the ligand where R = Ph is attributed to steric factors.

scholarly journals Transition Metal-Catalyzed α-Position Carbon–Carbon Bond Formations of Carbonyl Derivatives

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 861 ◽  
Author(s):  
Ha-Eun Lee ◽  
Dopil Kim ◽  
Ahrom You ◽  
Myung Hwan Park ◽  
Min Kim ◽  
...  
Keyword(s):  
Transition Metal ◽  
Carbonyl Compounds ◽  
Bond Formation ◽  
Chiral Ligand ◽  
Catalytic Systems ◽  
Carbon Bond ◽  
Carbonyl Derivatives ◽  
Carbon Carbon Bond ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

α-Functionalization of carbonyl compounds in organic synthesis has traditionally been accomplished via classical enolate chemistry. As α-functionalized carbonyl moieties are ubiquitous in biologically and pharmaceutically valuable molecules, catalytic α-alkylations have been extensively studied, yielding a plethora of practical and efficient methodologies. Moreover, stereoselective carbon–carbon bond formation at the α-position of achiral carbonyl compounds has been achieved by using various transition metal–chiral ligand complexes. This review describes recent advances—in the last 20 years and especially focusing on the last 10 years—in transition metal-catalyzed α-alkylations of carbonyl compounds, such as aldehydes, ketones, imines, esters, and amides and in efficient carbon–carbon bond formations. Active catalytic species and ligand design are discussed, and mechanistic insights are presented. In addition, recently developed photo-redox catalytic systems for α-alkylations are described as a versatile synthetic tool for the synthesis of chiral carbonyl-bearing molecules.

scholarly journals Binuclear Rhenium and Manganese Carbonyl Compounds Containing Hetero-Mercaptanes

2012 ◽  
Vol 25 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Md Anwarul Hoque ◽  
Md Arzu Miah ◽  
Md Nurul Abser ◽  
Abul K Azad ◽  
Kamrun N Khan ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Spectral Data ◽  
1H Nmr ◽  
Metal Atom ◽  
Carbonyl Compounds ◽  
Chemical Society ◽  
Mass Spectral Data ◽  
Heterocyclic Ligands ◽  
Mass Spectral ◽  
Manganese Carbonyl

Treatment of 2-Mercaptothiazoline, 2-Mercaptobenzimidazole, 2-Mercapto-1- methylimidazole with [M2(CO)10] (M = Re and Mn) at ambient temperature in presence of decarbonylating reagent Me3NO give the complexes [Mn2(?-?2-C3H4NS2)2(CO)6] (1), [Re2(?-?2-C3H4NS2)2(CO)6] (2), [Mn2(?-?2-C7H5SN2)2(CO)6] (3), [Re2(?-?2- C7H5SN2)2(CO)6] (4), [Re2(?-?2-C4H5N2S)2(CO)6] (5) and [Re2(?1-C4H5N2SH)(CO)9] (6) respectively. All the compounds have been characterized by IR, 1H NMR and mass spectral data. The heterocyclic ligands are expected to be coordinated to two or single metal atom through the nitrogen and sulfur atoms or via only sulfur atom.DOI: http://dx.doi.org/10.3329/jbcs.v25i1.11775 Journal of Bangladesh Chemical Society, Vol. 25(1), 62-70, 2012> 

Chemical reactions in solid manganese carbonyl compounds

1971 ◽  
Vol 26 (1) ◽  
pp. 119-124 ◽  
Author(s):  
I.G. de Jong ◽  
S.C. Srinivasan ◽  
D.R. Wiles
Keyword(s):  
Chemical Reactions ◽  
Carbonyl Compounds ◽  
Manganese Carbonyl

Synthesis, X-Ray Analysis, and Electrochemical Study of Some Manganese Carbonyl Derivatives with 1,1′-Bis(diphenylphosphino)ferrocene, dppfe

1994 ◽  
Vol 67 (9) ◽  
pp. 2440-2446 ◽  
Author(s):  
Satoru Onaka ◽  
Masa-aki Haga ◽  
Shigeru Takagi ◽  
Mayumi Otsuka ◽  
Katuya Mizuno
Keyword(s):  
Electrochemical Study ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Manganese Carbonyl

scholarly journals An Unprecedented Straightforward Synthesis of Chiral Pyrrolo[3,4-b]quinolone and Pyrrolo[3,2-b]quinolone Backbones Starting fromtrans-4-Hydroxy-L-proline

2016 ◽  
Vol 2016 ◽  
pp. 1-5
Author(s):  
Sébastien Comesse ◽  
Adam Daïch
Keyword(s):  
Carbonyl Compounds ◽  
Good Yield ◽  
Anticancer Activities ◽  
Carbonyl Derivatives

The straightforward synthesis of pyrrolo[3,4-b]quinolone and pyrrolo[3,2-b]quinolone backbones, which can be found in molecules exhibiting anticancer activities, is presented. The key step of the process is an efficient and unprecedented Friedländer condensation between an oxoproline carbamate, obtained in 3 steps and good yield starting from commercially available and relatively cheaptrans-4-hydroxy-L-proline, and various 2-amino-substituted carbonyl derivatives. It was demonstrated that the formation of the two possible regioisomers was fully triggered by both the R substituent onto the 2-amino-substituted carbonyl compounds and the ester function onto the oxoproline carbamate. Thus, in some cases, a complete regiocontrol for the Friedländer reaction could be attained.

Polyhedral manganese carbonyl derivatives of the B6C2H82- ligand

1969 ◽  
Vol 8 (8) ◽  
pp. 1801-1803 ◽  
Author(s):  
A. Denise George ◽  
M. Frederick Hawthorne
Keyword(s):  
Carbonyl Derivatives ◽  
Manganese Carbonyl ◽  
Derivatives Of

Rhenium and manganese carbonyl compounds incorporating tridentate chelating pyrazolyl gallate ligands

1985 ◽  
Vol 63 (8) ◽  
pp. 2261-2272 ◽  
Author(s):  
Brenda M. Louie ◽  
Steven J. Rettig ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Carbonyl Compounds ◽  
Reducing Agents ◽  
X Ray ◽  
H Nmr ◽  
Structure Determinations ◽  
Manganese Carbonyl ◽  
Rhenium Tricarbonyl ◽  
Mode Of Coordination ◽  
Selection Of

The coordinating properties of a variety of unsymmetrical uninegative tridentate chelating "pyrazolylgallate" ligands have been studied using the tricarbonyl moieties "M(CO)3", where M = Mn or Re, as acceptor species. A series of monomeric, pseudo octahedral complexes has been characterized and a fac mode of coordination established for the tridentate gallate ligands from 1H nmr, ir measurements, and X-ray structure determinations. Nitrosylation of a selection of the rhenium tricarbonyl compounds has yielded a number of cationic rhenium mononitrosyl dicarbonyl species. The reactivity of these cations towards reducing agents has been investigated.

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