Selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturat

Details Selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturat Selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturat

1999-03-25

2000-11-21

Padmanabhan, Sreeni

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568396, C07C 4562

Patent

active

061505641

ABSTRACT:
The invention relates to a process for the selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturated carbonyl compounds of the formula I, ##STR1## where R.sub.1 is hydrogen or an organic radical, and R.sub.2, R.sub.3 and R.sub.4, independently of one another, are hydrogen or a C.sub.1 -- to C.sub.4 --alkyl group, to saturated carbonyl compounds of the formula II ##STR2## using hydrogen in the presence of a pulverulent palladium and/or rhodium catalyst and in the presence of an organic base. The process is carried out in a packed bubble column reactor (1, 2) with product recycling (11, 17) and circulating hydrogen gas (4, 15, 16). It is particularly suitable for the selective hydrogenation of citral to citronellal.

REFERENCES:
patent: 4320228 (1982-03-01), Horner et al.
patent: 4847016 (1989-07-01), Gobel

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