Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673

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Kinetic and Stereochemical Analyses of Amine-Additive Effects on the Hydrogenation of α-Phenylcinnamic Acid over Cinchonidine-Modified Pd/C
Kengo NakaiTomonori MisakiYasuaki OkamotoTakashi Sugimura
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JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: 20140292


Asymmetric hydrogenation of α-phenylcinnamic acid catalyzed by cinchonidine (CD)-modified palladium has been performed. Without benzylamine (BA), a modification inconsistency was observed: the rate diminished when a small amount of CD was used, whereas the product enantiomeric excess (ee) increased when substantially more CD was used. By altering amount of amine additive, we deduced that this inconsistency was caused by the amine effect of CD itself. With a 1,8-diazabicyclo[5.4.0]undec-7-ene additive, the catalytic amount was sufficient to result in the highest ee of 81%.

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