scholarly journals Terminal and Non Terminal Alkynes Partial Hydrogenation Catalyzed by Some d8 Transition Metal Complexes in Homogeneous and Heterogeneous Systems

Hydrogenation ◽  
10.5772/47742 ◽  
2012 ◽  
Author(s):  
Domingo Liprandi ◽  
Edgardo Cagnola ◽  
Cecilia Lederhos ◽  
Juan Badano ◽  
Monica Quirog
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Heterogeneous Systems ◽  
Partial Hydrogenation ◽  
Terminal Alkynes

Transition metal complexes of substituted alkynes. IV. Some bridging alkynecobalt complexes

1969 ◽  
Vol 22 (3) ◽  
pp. 533 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Spectroscopic Properties ◽  
Terminal Alkynes ◽  
Nuclear Magnetic Resonance Spectra ◽  
Direct Formation ◽  
Formation Of Complexes

Two new organocobalt complexes, Co2(CO)4(CF3C2CF3)3 and Co2(CO)4(CF3C3H)2- CF3C2CF3, have been isolated from the appropriate reactions of hexafluorobut-2-yne with octacarbonyldicobalt and of 3,3,3- trifluoropropyne with μ-hexafluorobut-2-yne-hexacarbonyldicobalt. The probable structures of these compounds are discussed in light of their infrared and nuclear magnetic resonance spectra. ��� The direct formation of complexes of the type Co3(CO)9CCH2R has been established in the reactions of several terminal alkynes, RC2H (R = H, CF3, C6H5), with octacarbonyldicobalt. The spectroscopic properties of the products so obtained are given.

New cyclizations via catalytic ruthenium vinylidenes

2008 ◽  
Vol 80 (5) ◽  
pp. 1167-1177 ◽  
Author(s):  
Jesús A. Varela ◽  
Carlos González-Rodríguez ◽  
Silvia G. Rubín ◽  
Luis Castedo ◽  
Carlos Saá
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Nucleophilic Attack ◽  
Terminal Alkynes ◽  
Pericyclic Reactions ◽  
Catalytic Metal ◽  
Cyclic Compounds

New carbocyclizations that proceed via catalytic metal-vinylidenes are presented. Metal-vinylidene catalytic species, which are easily accessible from terminal alkynes and catalytic amounts of transition-metal complexes, can be involved either in pericyclic reactions or in tandem processes triggered by nucleophilic attack at the electrophilic position of the vinylidene. In both cases, a wide variety of valuable cyclic compounds are easily accessible. Some recent carbocyclizations will be described.

Transition metal complexes of substituted alkynes. X. The formation of disubstituted cyclopentadienone complexes from terminal alkynes and (η-C5H5)Co(CO)2

1973 ◽  
Vol 26 (9) ◽  
pp. 1911 ◽  
Author(s):  
RS Dickson ◽  
HP Kirsch
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Steric Effects ◽  
Terminal Alkynes ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
Electronic And Steric Effects

The reaction at 160� of dicarbonyl(η-cyclopentadienyl)cobalt with each of the terminal alkynes phenylacetylene, t-butylacetylene, propyne, and 3,3,3-trifluoropropyne has been studied. The reactions give p(disubstituted cyclopentadienone)-η-cyclopenta-dienylcobalt complexes as the major products; two or three isomers of each cyclo- pentadienonecobalt complex are formed. The arrangement of the substituents in each isomer has been assigned on the basis of electronic, infrared, nuclear magnetic resonance, and mass spectral data. Attempts to rationalize the distribution of isomers are based on considerations of electronic and steric effects.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

Density Functional Calculations of EPR Parameter g Tensors of Some Transition Metal Complexes

2011 ◽  
Vol 2 (2) ◽  
pp. 139-141
Author(s):  
Vinita Prajapati ◽  
◽  
P.L.Verma P.L.Verma ◽  
Dhirendra Prajapati ◽  
B.K.Gupta B.K.Gupta
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Density Functional Calculations ◽  
Density Functional

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

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