A series of hydroxybenzenesulfonyl fluorides and derivatives thereof was synthesized and evaluated as fast plant desiccants. Their activity was compared with the plant response of some hydroxybenzenesulfonyl chlorides and other related benzenesulfonyl compounds, and with some structurally unrelated commercial products. Structure-activity relationship is discussed. 3-Chloro-4-hydroxybenzenesulfonyl fluoride, 3,5-dichloro-4-hydroxybenzenesulfonyl fluoride, and 3,6-dichloro-4-hydroxybenzenesulfonyl fluoride caused considerable desiccation in 1 to 5 days in field tests.
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