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Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH 3 CO) 2 O. Commonly abbreviated Ac 2 O, it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis. It is a colorless liquid that smells strongly of acetic acid, which is formed by its reaction with ...
An acid anhydride is a type of chemical compound derived by the removal of water molecules from an acid. In organic chemistry, organic acid anhydrides contain the functional group −C(=O)−O−C(=O)−. Organic acid anhydrides often form when one equivalent of water is removed from two equivalents of an organic acid in a dehydration reaction.
A common type of organic acid anhydride is a carboxylic anhydride, where the parent acid is a carboxylic acid, the formula of the anhydride being (RC(O)) 2 O. Symmetrical acid anhydrides of this type are named by replacing the word acid in the name of the parent carboxylic acid by the word anhydride. [2] Thus, (CH 3 CO) 2 O is called acetic ...
European and Japanese companies use the reaction of sodium tert-butoxide with carbon dioxide, catalysed by p-toluenesulfonic acid or methanesulfonic acid. This process involves a distillation of the crude material yielding a very pure grade. Boc anhydride is also available as a 70% solution in toluene or THF. As boc anhydride may melt at ...
Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Acid anhydrides" The following 17 pages are in this category, out of 17 ...
First, the Lewis acid catalyst activates the TFBA, and then a carboxyl group in carboxylic acid reacts with the activated TFBA to produce mixed anhydride (MA) once. Then, a carbonyl group derived from the carboxylic acid in MA is selectively activated and is attacked by a hydroxyl group in the alcohol through intermolecular nucleophilic ...
Triflic anhydride is prepared by dehydration of triflic acid using P 4 O 10. [2] Triflic anhydride is useful for converting ketones into enol triflates. [4] In a representative application, is used to convert an imine into a NTf group. [5] It will convert phenols into a triflic ester, which enables cleavage of the C-O bond. [6] [7]
Isobutyric anhydride is an organic compound with the formula ((CH 3) 2 CHCO) 2 O. It is an acyclic carboxylic anhydride of isobutyric acid. [2] It is classified as an organic acid anhydride, being derived from dehydration of isobutyric acid. It is a colorless liquid with a strong, pungent odor. [3] [4]