Process for the prepartion of 3-hydroxyalkanals

Details Process for the prepartion of 3-hydroxyalkanals Process for the prepartion of 3-hydroxyalkanals

1992-11-24

1994-02-08

Lone, Werren B.

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

Organic compounds

Oxygen containing

568895, 568496, C07C 4561, C07C 4564

Patent

active

052849791

ABSTRACT:
A process is disclosed for the preparation of 3-hydroxyalkanals having 3 to 12 carbon atoms, in particular 3 or 4 carbon atoms, by hydration of the underlying 2-alkenals with water in a homogeneous phase in the presence of an acid catalyst. The previously known hydration using mineral acids or carboxylic acids as catalyst results in low volume/time yields and/or low selectivities. These disadvantages can be avoided by using in the present invention, as catalyst, a dissolved acid-base buffer which results in a pH of from 2 to 5 in the reaction mixture; the acid component and corresponding base of which are present in a total quantity of from 0.5 to 40% by weight in the reaction mixture. The preferred buffers composed of a lower monobasic carboxylic acid and a tertiary amine can easily be recycled.

REFERENCES:
patent: 3833659 (1974-09-01), Schmerling et al.
patent: 4709098 (1987-11-01), Dolifini et al.
patent: 5015789 (1991-05-01), Arntz et al.

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