Back حمض السلفونيك Arabic Sulfoturşular Azerbaijani Сульфакіслоты Byelorussian Àcid sulfònic Catalan Sulfonová kyselina Czech Sulfonsyre Danish Sulfonsäuren German Sulfonata acido Esperanto Ácido sulfónico Spanish سولفونیک اسید Persian

Sulfonic acid

General structure of a sulfonic acid with the functional group indicated in blue

In organic chemistry, sulfonic acid (or sulphonic acid) refers to a member of the class of organosulfur compounds with the general formula R−S(=O)2−OH, where R is an organic alkyl or aryl group and the S(=O)2(OH) group a sulfonyl hydroxide.[1] As a substituent, it is known as a sulfo group. A sulfonic acid can be thought of as sulfuric acid with one hydroxyl group replaced by an organic substituent. The parent compound (with the organic substituent replaced by hydrogen) is the parent sulfonic acid, HS(=O)2(OH), a tautomer of sulfurous acid, S(=O)(OH)2.[a] Salts or esters of sulfonic acids are called sulfonates.

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