Tartaric anhydride diacetate

Tangential apparatus, 37, 67 Tartaric acid, 35, 50 Tartaric anhydride, diacetate oe d-, 35, 49... 

DIACETYL-d-TARTARIC ANHYDRIDE (Tartaric anhydride, diacetate of d )... 

Wohl and Oesterlin describe the preparation of tartaric anhydride diacetate 841 A mixture of acetic anhydride (120 ml) and concentrated sulfuric acid (3 ml) is poured on finely powdered tartaric acid (100 g), considerable heat being evolved and the tartaric acid dissolving. The mixture is boiled for a short time, then cooled. Tartaric anhydride diacetate crystallizes in almost quantitative yield and is filtered off and washed with benzene. The crude product can be used for preparation of carbon suboxide. For purification it is crystallized from benzene, then having m.p. 135°. 

Condensation polymerization of glycols with tartaric acid results in poly(alkylene tartrate)s [42 4]. The hydroxylated polyesters from C2 and C4 are hydrophilic and water soluble and those from C6 and higher glycol are water insoluble with increase in hydrophobicity with increasing size of glycols. Crosslinkable unsaturated poly(alkylene tartrate)s are obtained by adding maleic anhydride to the polymerization of glycols with tartaric acid (4) [45]. Poly(tartrate) was obtained from the condensation of tartaric acid ketal with tartaric acid diacetate [46]. 

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