Succinic anhydride solubility in water is quite poor. It solubilizes progressively while the succinylation reaction takes place. Under conditions of large excess, the reaction solution is thus kept saturated. When larger amounts of succinic anhydride are used, the solution may become acidic, with consequent decrease of reaction speed.
Trifluoroacetic anhydride upon mixing with dimethyl sulfoxide can undergo a violent reaction at or just below room temperature. However, it is possible to moderate this behavior by working at temperatures below −60 °C in an inert solvent such as dichloromethane, 22 when dimethyl sulfoxide and trifluoroacetic anhydride react exothermically and instantly to form a white precipitate, which is .
Chemical Modification of Cellulose with Succinic Anhy dride in Ionic Liquid with or without Catalysts 83 (450-900 Í m). Ionic liquid [C4mim]Cl was obtained from the Chemer Chemical Co., Ltd., Hangzhou, China, and used as received.
The patent describes the reaction of the olefins with excess maleic anhydride at 200 °C in an autoclave. The excess alkene is removed by distillation in vacuo, the resulting alkenyl succinic anhydride hydrolyzed with dilute sodium hydroxide solution and the disodium salt reacted with an acid to achieve an alkenebutanedioic acid.
Propargyl alcohol (40.0 g, 0.741 mol), DMAP (17.43 g, 0.143 mol) and succinic anhydride (85.7g, 0.856 mol) were dissolved in DCM (100 ml) to react overnight. 75 ml of water added to the solution followed by extraction with NaHSO. 4 (10 %) for three times. The organic phase was then dried with MgSO. 4, filtered and concentrated.
Sep 14, 2006· Octenyl succinic anhydride (OSA) modified starch was patented by Caldwell and Wurzburg . In the United States, FDA approved OSA starch for food use in 1972. The maximum level of OSA treatment allowed is 3% (degree of substitution (DS)≈0.02). However, in China the investigation and application of OSA starch are scarce.
Acylation Reactions. N- and O-Acylation.. Succinic anhydride (1) is a reactive acylating agent and reacts rapidly with amines.For alcohols, procedures often call for use of Pyridine or 4-Dimethylaminopyridine as catalyst. The N-acylation reaction has been extensively used for the synthesis of chiral succinimides (eq 1), 1a which are important intermediates in asymmetric synthesis. 1 The O .
Succinic anhydride | C4H4O3 | CID 7922 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities .
Preparation. In the laboratory, this material can be prepared by dehydration of succinic acid.Such dehydration can occur with the aid of acetyl chloride or phosphoryl chloride, or thermally.. Industrially, succinic anhydride is prepared by catalytic hydrogenation of maleic anhydride.. Reactions. Succinic anhydride hydrolyzes readily to give succinic acid:
The reaction between phenol and ethanoic anhydride isn't particularly important, but you would get an ester just as you do with an alcohol. Or, more simply: Especially if you write the equation in this second way, it is obvious that you have just produced another ester - in this case, called phenyl ethanoate.