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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).
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:
One route to thioesters involves the reaction of an acid chloride with an alkali metal salt of a thiol: [1] RSNa + R'COCl → R'COSR + NaCl. Another common route entails the displacement of halides by the alkali metal salt of a thiocarboxylic acid. For example, thioacetate esters are commonly prepared by alkylation of potassium thioacetate: [1]
At neutral pH, thiocarboxylic acids are fully ionized. Thiocarboxylic acids are about 100 times more acidic than the analogous carboxylic acids. Thiobenzoic acid has a pK a of 2.48 compared with 4.20 for benzoic acid, and thioacetic acid has a pK a near 3.4 compared with 4.72 for acetic acid. [8]
Thiophene-3-acetic acid is an organosulfur compound with the formula HO 2 CCH 2 C 4 H 3 S. It is a white solid. It is one of two isomers of thiophene acetic acid, the other being thiophene-2-acetic acid. Thiophene-3-acetic acid has attracted attention as a precursor to functionalized derivatives of polythiophene. [1]
The Central State Film Archive (Albanian: Arkivi Qendror Shtetëror i Filmit) is the main film archive of Albania based in Tirana which lists in its repository 271 feature films, 166 animated films, 1,131 documentaries, and 1,012 film chronicles between the years 1945–2015.
Shqip; Simple English; Српски / srpski; ... Agon (film) The Albanian; Alexander (2023 film) Alive (2009 film) Amnesty (2011 film) Amsterdam Express; B. Babai (film)