CYCLOBUTADIENE–METAL COMPLEXES: PART VIII. SYNTHESIS OF TETRAPHENYLCYCLOBUTADIENE NICKEL HALIDES BY LIGAND-EXCHANGE REACTIONS

1966 ◽  
Vol 44 (22) ◽  
pp. 2673-2677 ◽  
Author(s):  
D. F. Pollock ◽  
P. M. Maitlis
Keyword(s):  
Metal Complex ◽  
Metal Complexes ◽  
Ligand Exchange ◽  
Palladium Complexes ◽  
Exchange Reactions ◽  
Reaction Proceeds ◽  
Halide Complexes

The preparation of cyclobutadiene nickel halide complexes (R4C4NiX2)2, where R is phenyl or substituted phenyl, by reaction of the palladium complexes, [R4C4PdX2]2, with a tert-phosphine metal complex, e.g. (n-Bu3P)2NiX2, is described. The reaction proceeds according to the equation[Formula: see text]Possible mechanisms are suggested.

Phosphorus-31, mercury-199 and selenium-77 n.m.r. studies of ligand exchange reactions in mercury(II) halide complexes

1980 ◽  
Vol 33 (7) ◽  
pp. 1463 ◽  
Author(s):  
R Colton ◽  
D Dakternieks
Keyword(s):  
Time Scale ◽  
Ligand Exchange ◽  
Room Temperature ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Exchange Reactions ◽  
Halogen Exchange ◽  
Redistribution Reactions ◽  
Halide Complexes

Mercury(II) halide complexes of tris(4-methoxyphenyl)phosphine have been investigated by 31P and 199Hg n.m.r. spectroscopy of CH2Cl2 solutions. At room temperature the phosphine exchanges at an appreciable rate and halogen exchange is fast. At -50°C both phosphine and halogen exchange are slow on the n.m.r. time scale and halogen redistribution reactions are observed. ��� Mercury(II) halide complexes with tributylphosphine selenide have been investigated by 31P, 199Hg and 77Se n.m.r. methods. This ligand is labile and exchanges rapidly on the n.m.r. time scale at room temperature, although the exchange can be slowed down at about -100°C. Halogen exchange is also fast at room temperature. ��� Ligand exchange reactions between tributylphosphine and either tris(4-methoxyphenyl)phosphine or tributylphosphine selenide were investigated and redistribution reactions to give mixed ligand complexes were observed.

Triazolylidene Metal Complexes Tagged with a Bodipy Chromophore: Synthesis and Monitoring of Ligand Exchange Reactions

2017 ◽  
Vol 36 (8) ◽  
pp. 1469-1478 ◽  
Author(s):  
Miquel Navarro ◽  
Suxiao Wang ◽  
Helge Müller-Bunz ◽  
Gareth Redmond ◽  
Pau Farràs ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Ligand Exchange ◽  
Exchange Reactions

The metal complex catalyzed reactions of anils. I. The reaction of acetone with anilines

1976 ◽  
Vol 54 (24) ◽  
pp. 3895-3908 ◽  
Author(s):  
A. R. Boate ◽  
D. R. Eaton
Keyword(s):  
Proton Transfer ◽  
Metal Complex ◽  
Metal Complexes ◽  
Ligand Exchange ◽  
Equilibrium Constants ◽  
Catalytic Reactions ◽  
Rate Data ◽  
Aliphatic Ketones ◽  
Synthetic Routes ◽  
Catalyzed Reactions

It has been shown that the formation of anils from anilines and aliphatic ketones is homogeneously catalyzed by a variety of metal complexes. The products of the reactions have been unambiguously identified by preparing the anils using other synthetic routes. The catalysis is quite general and the system is therefore suitable for a systematic catalytic study varying both the catalysts and the substrates. The related reactions of anil hydrolysis and transimination may also be studied. The catalysts used, thiourea complexes of Co(II), Ni(II), and Zn(II), vary in their effectiveness by more than two orders of magnitude. In the present paper experiments defining the catalytic system are described. The equilibrium constants for the complexation of all the substrate molecules have been determined. Qualitative rate data on various ligand exchange and proton transfer steps is presented to demonstrate that such reactions cannot be rate determining in the overall catalytic reactions.

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