Catalytic preparation of formaldehyde condensates

Details Catalytic preparation of formaldehyde condensates Catalytic preparation of formaldehyde condensates

1993-03-26

1994-03-29

Lone, Werren B.

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

Organic compounds

Oxygen containing

568458, C07C 4572

Patent

active

052986683

ABSTRACT:
Arycolaldehyde, glyceraldehyde, C.sub.4 - and C.sub.5 -sugars or mixtures thereof are prepared in a self-condensation of formaldehyde by reacting formaldehyde or a formaldehyde donor in the presence of a mesoionic catalyst of the formula ##STR1## wherein X is nitrogen or CR.sup.3, Y is sulfur or selenium or NR.sup.4, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be identical or different and each can represent an aliphatic, aryl, aralkyl or heteroaryl group which is unsubstituted or which bears substituents which have only a negligible effect on the catalytic activity of said mesoionic catalyst, with the proviso that R.sup.2 together with R.sup.4 can form a C.sub.2 -C.sub.5 -alkylene or alkenylene bridge or a C.sub.6 -C.sub.14 -arylene bridge, and wherein R.sup.5 is hydrogen, the hydroxymethyl group -CH.sub.2 OH or the hydroxymethylhydroxymethyl group --CH(OH)(CH.sub.2 OH).

REFERENCES:
patent: 2224910 (1940-12-01), Hanford et al.
patent: 3865850 (1975-02-01), Merger
patent: 4615970 (1986-10-01), Kojima et al.
patent: 5144088 (1992-09-01), Salek et al.
Tetrahedron Letters, vol. pp. 4517-4520 (1980).

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