Solvent Effect on Enantioselective Hydrogenation of (E)-α-Phenylcinnamic Acid with Cinchonidine-Modified Palladium Catalysts

1995 ◽  
Vol 24 (2) ◽  
pp. 165-165 ◽  
Author(s):  
Yuriko Nitta ◽  
Kazuya Kobiro
Keyword(s):  
Solvent Effect ◽  
Palladium Catalysts ◽  
Enantioselective Hydrogenation

Hydrogenation of cinnamyl methyl ether and allylbenzene on palladium catalysts

1987 ◽  
Vol 52 (4) ◽  
pp. 1015-1020 ◽  
Author(s):  
Libor Červený ◽  
Ivo Paseka ◽  
Eva Fialová ◽  
Vlastimil Růžička
Keyword(s):  
Double Bond ◽  
Solvent Effect ◽  
Benzene Ring ◽  
Methyl Ether ◽  
Atmospheric Pressure ◽  
Palladium Catalysts ◽  
Polar Medium ◽  
Adsorbed Molecules ◽  
Ionic Nature ◽  
Bond Splitting

The hydrogenation of cinnamyl methyl ether and allylbenzene in hexane and acetone at 20 °C and atmospheric pressure of hydrogen has been studied on eight palladium catalysts. The hydrogenation of cinnamyl methyl ether is accompanied by C-O bond splitting giving rise to propylbenzene and methanol, the hydrogenation of allylbenzene is associated with the isomerization of the double bond resulting in its conjugation with the benzene ring. A marked solvent effect on the selectivity of hydrogenation of cinnamyl methyl ether has been observed and ascribed to the effect of solvated protons on the adsorbed molecules of the ether which is promoted by polar medium. The solvent effect on the isomerization of allylbenzene during the hydrogenation is little pronounced, which suggests that this reaction is not of ionic nature.

Enantioselective hydrogenation of fluorinated unsaturated carboxylic acids over cinchona alkaloid modified palladium catalysts

2008 ◽  
Vol 9 (3) ◽  
pp. 421-424 ◽  
Author(s):  
György Szőllősi ◽  
Tibor Varga ◽  
Károly Felföldi ◽  
Szabolcs Cserényi ◽  
Mihály Bartók
Keyword(s):  
Carboxylic Acids ◽  
Palladium Catalysts ◽  
Enantioselective Hydrogenation ◽  
Cinchona Alkaloid ◽  
Unsaturated Carboxylic Acids

Enantioselective Hydrogenation of (E)-α-Phenylcinnamic Acid over Cinchonidine-Modified Palladium Catalysts

1994 ◽  
Vol 23 (6) ◽  
pp. 1095-1098 ◽  
Author(s):  
Yuriko Nitta ◽  
Yoshiyuki Ueda ◽  
Toshinobu Imanaka
Keyword(s):  
Palladium Catalysts ◽  
Enantioselective Hydrogenation
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