The mono-sulfate analogues of quercetin and catechin were also prepared following the monosulfation reaction procedure used with PCA employing Et3N•SO3 as a source of sulfate. Correia-da-Silva and co-workers have investigated the synthesis of persulfated compounds which can be used as an anticoagulant and antiplatelet agents for the treatment of thrombosis. Sulfation of different polyphenolic molecules such as gallic acid, 4-methyl 7-hydroxycoumarin 7-ß-D-glucopyranoside, and ascorbic acid was afforded using Et3N•SO3 (2-8 eq./OH group) in dimethylacetamide (DMA) at 65 °C for 24 h reaction duration. A summary of the scope and range of sulfated molecules achievable with Et3NSO3 complex are listed in Table .