Solid bases as catalysts in aldol condensations

Details Solid bases as catalysts in aldol condensations Solid bases as catalysts in aldol condensations

1992-12-09

1993-10-19

Lone, Werren B.

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

Organic compounds

Oxygen containing

568461, 568459, 568462, 568464, 568884, C07C 4573, C07C 4572

Patent

active

052547434

ABSTRACT:
Solid solutions of a class of divalent metal oxides and a class of trivalent metal oxides resulting from calcination of layered double hydroxides related to hydrotalcite have been prepared with a surface area in excess of 150 m.sup.2 /g. Such high surface area materials are found to be quite effective in the aldol condensation of aldehydes and ketones, and in particular in the conversion of n-butyraldehyde to 2-ethyl-2-hexenal in high yield and with good selectivity in a liquid phase reaction at temperatures under about 200.degree. C. Variants can be devised where the aldol condensation product, an .alpha.,.beta.-unsaturated aldehyde or ketone, is concurrently reduced to the saturated alcohol under process conditions.

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