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Thioacetic acid is an organosulfur compound with the molecular formula CH 3 C(O)SH. It is a thioic acid: the sulfur analogue of acetic acid (CH 3 C(O)OH), as implied by the thio-prefix. It is a yellow liquid with a strong thiol-like odor. It is used in organic synthesis for the introduction of thiol groups (−SH) in molecules. [4]
General structure of a monothioacetal General structure of a dithioacetal. In organosulfur chemistry, thioacetals are the sulfur analogues of acetals (R−CH(−OR) 2).There are two classes: the less-common monothioacetals, with the formula R−CH(−OR')−SR", and the dithioacetals, with the formula R−CH(−SR') 2 (symmetric dithioacetals) or R−CH(−SR')−SR" (asymmetric dithioacetals).
Acid anhydrides and some lactones also give thioesters upon treatment with thiols in the presence of a base. Thioesters can be conveniently prepared from alcohols by the Mitsunobu reaction, using thioacetic acid. [6] They also arise via carbonylation of alkynes and alkenes in the presence of thiols. [7]
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In a common application, potassium thioacetate is combined with alkylating agents to give thioacetate esters (X = halide): . CH 3 COSK + RX → CH 3 COSR + KX. Hydrolysis of these esters affords thiols:
The reaction was first reported in 1949 with thioacetic acid as reagent [3] [4] and rediscovered in 2009. [5] It is used in click chemistry [ 6 ] [ 7 ] [ 8 ] and in polymerization , especially with dendrimers .
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