2-R1-1,2,4-triazolo[5,1-c]triazm-7(4H)-ones react with resorcinols in trifluoroacetic acid yielding 5-R2-6-hydroxy-3-(5′-R 2-2′,4′-dihydroxyphenyl)benzo[b]furan-2(3H)-one. The reaction with resorcinol ether gave 2,2-bis(2′,4′-dimethoxyphenyl)acetic acid.