Carbic Anhydride
Title: Carbic Anhydride
CAS Registry Number: 129-64-6
CAS Name: 3aa,4,7,7aa-Tetrahydro-4a,7a-methanoisobenzofuran-1,3-dione
Additional Names: cis-endo-5-norbornene-2,3-dicarboxylic anhydride; endo-cis-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride; 3,6-endo-methylene-1,2,3,6-tetrahydro-cis-phthalic anhydride; 3,6-endo-methylene-D4-tetrahydrophthalic anhydride; nadic anhydride
Molecular Formula: C9H8O3
Molecular Weight: 164.16
Percent Composition: C 65.85%, H 4.91%, O 29.24%
Literature References: Prepd by the reaction of maleic anhydride with cyclopentadiene in benzene: Diels, Alder, Ann. 460, 98 (1928). Crystal structure: Destro et al., Acta Crystallogr. 25B, 2465 (1969).
Properties: Shiny, orthorhombic crystals from petr ether, mp 164-165°. d 1.417. Converted to equilibrium mixtures with exo-cis isomers when heated above mp. Sol in benzene, toluene, acetone, carbon tetrachloride, chloroform, ethanol, ethyl acetate. Slightly sol in petr ether. Reacts with water to form the corresponding acid. Forms the g-lactone of 5-hydroxy-2,3-norcamphanedicarboxylic acid in 50% H2SO4.
Melting point: mp 164-165°
Density: d 1.417

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