Process for the purification of coumarins

Details Process for the purification of coumarins Process for the purification of coumarins

1975-03-12

1977-02-15

Rollins, Alton D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

25230129, C07D40510, C07D40514

Patent

active

040082482

ABSTRACT:
Brighteners of the formula ##STR1## wherein R denotes hydrogen or an aliphatic or aromatic radical and Ar denotes an aromatic carbocyclic or heterocyclic radical, can be purified from colored by-products by dissolving in mineral acids and crystallized out by cooling without reduction in yield.

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