Reported in EPA TSCA Inventory.

The 2,3-Dimethylmaleic anhydride, with the CAS registry number 766-39-2, is also known as Dimethylmaleic anhydride. It belongs to the product categories of Heterocycles Series; Carbonyl Compounds; Carboxylic Acid Anhydrides; Organic Building Blocks. Its EINECS registry number is 212-165-8. This chemical's molecular formula is C₆H₆O₃ and molecular weight is 126.11. What's more, both its IUPAC name and systematic name are the same which is called 3,4-Dimethylfuran-2,5-dione.

Physical properties about 2,3-Dimethylmaleic anhydride are: (1)ACD/LogP: 0.82; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.82; (4)ACD/LogD (pH 7.4): 0.82; (5)ACD/BCF (pH 5.5): 2.45; (6)ACD/BCF (pH 7.4): 2.45; (7)ACD/KOC (pH 5.5): 66.18; (8)ACD/KOC (pH 7.4): 66.18; (9)#H bond acceptors: 3; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 43.37 Å²; (13)Index of Refraction: 1.486; (14)Molar Refractivity: 29.32 cm³; (15)Molar Volume: 102 cm³; (16)Surface Tension: 36.9 dyne/cm; (17)Density: 1.236 g/cm³; (18)Flash Point: 95.6 °C; (19)Enthalpy of Vaporization: 45.95 kJ/mol; (20)Boiling Point: 223 °C at 760 mmHg; (21)Vapour Pressure: 0.0986 mmHg at 25 °C.

Uses of 2,3-Dimethylmaleic anhydride: it is used to produce other chemicals. For example, it can react with Methanol to get Dimethylmaleic acid dimethyl ester. The reaction occurs with reagent H₂SO₄ and other condition of heating for 93 hours. The yield is 90 %.

When you are dealing with this chemical, you should be very careful. It may cause damage to health and it may cause inflammation to the skin or other mucous membranes. This chemical is harmful if swallowed. Therefore, you should wear suitable protective clothing, gloves and eye/face protection. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. And in case of accident or if you feel unwell seek medical advice immediately.

You can still convert the following datas into molecular structure:
(1) SMILES: O=C\1OC(=O)/C(=C/1C)C
(2) InChI: InChI=1S/C6H6O3/c1-3-4(2)6(8)9-5(3)7/h1-2H3
(3) InChIKey: MFGALGYVFGDXIX-UHFFFAOYSA-N