Solid catalysts for epimerization of aldoses; continuous interco

Details Solid catalysts for epimerization of aldoses; continuous interco Solid catalysts for epimerization of aldoses; continuous interco

1988-02-09

1989-03-28

Pal, Asok

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

536 11, 536124, 127 462, C13K 100, C13K 1300

Patent

active

048154458

ABSTRACT:
Anion exchange resins which have been exchanged with molybdate at acid pH are effective catalysts for epimerizing compounds with the structural unit: ##STR1## Cheif among these are aldoses, especially aldopentoses and aldohexoses, as well as some deoxy-sugars. A method for the continuous epimerization of aldoses and other compounds having the necessary structural feature shown using a fixed bed of molybdate-exchanged resin is quite efficient, and can be employed in enhancing the yield of the thermodynamically formed epimer which is produced as the minor epimer in a mixture under kinetic control.

REFERENCES:
patent: 4029878 (1977-06-01), Kruse
patent: 4718405 (1988-01-01), Firth et al.
Bilik & Coworkers, Chem. Abstract, 89, (19), 163846 (1978).
Hayes et al., J. Amer. Chem. Soc., 104, 6764 (1982).

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