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In a water/chlorobenzene biphasic reaction, the hydrogenation of trans‐ cinnamaldehyde, catalyzed by water‐soluble Ru(II)‐phosphane complexes at pH 3.04 (phosphate buffer), produces a 61:39 mixture of cinnamyl alcohol and dihydrocinnamaldehyde at 1 bar H 2 ; however, the selectivity is increased to 93:7 by increasing the hydrogen pressure to 8 bar.
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Papp et al. (2003) studied this question.
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