In situ catalysts in enantioselective catalysis with transition metal compounds

1995 ◽  
pp. 1-27 ◽  
Author(s):  
Henri Brunner ◽  
Wolfgang Zettlmeier
Keyword(s):  
Transition Metal ◽  
Transition Metal Compounds ◽  
Enantioselective Catalysis ◽  
Metal Compounds

Dehalogenation of Chloroarenes with Sodium Dihydridobis(2-methoxyethoxo)aluminate in the Presence of Transition Metal Compounds

1994 ◽  
Vol 59 (7) ◽  
pp. 1645-1653 ◽  
Author(s):  
Jaroslav Včelák ◽  
Jiří Hetflejš
Keyword(s):  
Kinetic Model ◽  
Transition Metal ◽  
Catalyst Deactivation ◽  
Transition Metal Compounds ◽  
Metal Species ◽  
Metal Compound ◽  
Transition Metal Compound ◽  
Metal Compounds ◽  
First Order

Dehalogenation of low-chlorinated arenes such as p-dichlorobenzene or chlorobenzene with the title hydride is accelerated in the presence of transition metal species formed in situ from the corresponding 2,4-pentanedionates. Their efficiency decreases in the order: Co ≈ Ni ≈ Pd > Cu >> Mn > Fe which results from changes of their activity and stability. The dehalogenation is well described by a kinetic model consisting of the set of dehalogenation steps which are first order in the chloroarene combined with the catalyst deactivation which is second order in the transition metal compound.

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