Diacetyltartaric anhydride

Alternatively, the compound may he prepared by thermal dissociation of diacetyltartaric anhydride. 

Diacetyltartaric anhydride, acetoxy maleic anhydride and diethyl oxaloacetate all yield carbon suboxide, C3O2 on pyrolysis. Carbon suboxide and protonated carbon suboxide are prominent ions in the mass spectra of all three of these compounds. 

Better yields are obtained by the pyrolysis of diacetyltartaric anhydride at 200° (41%). A review of the chemistry of this interesting substance has been made. ... 

Significant retardation was observed with the alkene additives and particularly with acetone or acetaldehyde. It has been experimentally observed that carbon suboxide prepared by the pyrolysis of diacetyltartaric anhydride is more stable toward polymerization than that prepared by the dehydration of malonic acid. We have observed infrared impurity bands at 3.65, 5.75,... 

Using an apparatus constructed on the same principles, Ott and Schmidt99 prepared carbon suboxide C302 by thermal decomposition of diacetyltartaric anhydride on a feebly glowing platinum catalyst — the nature of chemical reaction is obscure. 

Esters of monoglycerides with organic acids such as acetic acid, lactic acid, diacetyltartaric acid, succinic acid and citric acid are widely used as food emulsifiers. The esters are produced in standard batch reactors normally by reacting monoglycerides with the organic acid or its anhydride. A direct esterification of fatty acids, glycerol and the organic acid is also possible for some products. 

Recognition that 23 is actually the anhydride of acetylene dicarboxylic acid (225) led to some early attempts and claims of cyclization of this molecule with various reagents. Using acetic anhydride, the product isolated was acetoxymaleic anhydride (226), postulated as possibly arising from the addition of acetic acid to 23. Pyrolysis of either 226 or of diacetyltartaric acid... 

Monoacetyl- and diacetyltartaric acid Datem E472e anhydride Tartaric acid and acetic... 

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