ChemInform Abstract: Enantioselective Michael Reaction of Malonates and Chalcones by Phase-Transfer Catalysis Using Chiral Quaternary Ammonium Salt.

ChemInform ◽  
2010 ◽  
Vol 32 (46) ◽  
pp. no-no
Author(s):  
Dae Young Kim ◽  
Sun Chul Huh ◽  
Sung Min Kim
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Phase Transfer Catalysis ◽  
Michael Reaction ◽  
Phase Transfer

Novel coincidence effects in a bimetallic phase transfer catalyzed reaction. Biphasic reduction reactions catalyzed by rhodium carbonylmetallate clusters

1985 ◽  
Vol 63 (6) ◽  
pp. 1157-1160 ◽  
Author(s):  
Ferenc Joó ◽  
Howard Alper
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Phase Transfer ◽  
Nitro Compounds ◽  
Organic Substrate ◽  
Carbonyl Complexes ◽  
Cobalt Carbonyl ◽  
Reduction Reactions ◽  
Mild Conditions

Bimetallic and cluster rhodium carbonyl complexes catalyze the biphasic reduction of nitro compounds under mild conditions (using CO/5 M NaOH, C6H6 or PhCH3). Rate studies indicate the sensitivity of the reaction to the nature of the organic substrate, base concentration, and the temperature. A previously observed bimetallic (Co2(CO)8 and (1,5-HDRhCl)2) and phase transfer catalyzed [R4N+X−] reduction of nitro compounds was found to be a consequence of the inhibition and reactivation of the true catalyst by the quaternary ammonium salt and cobalt carbonyl, respectively.

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