1203-40-3

Basic information

• Product Name: dioxyphthalic acid
• Synonyms: dioxyphthalic acid;Diperoxyphthalic acid
• CAS NO: 1203-40-3
• Molecular Formula: C₈H₆O₆
• Molecular Weight: 198.12964
• EINECS: 214-870-6
• Mol File: 1203-40-3.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 435.6°Cat760mmHg
• Flash Point: 183.9°C
• Appearance: /
• Density: 1.557g/cm³
• Vapor Pressure: 2.33E-08mmHg at 25°C
• Refractive Index: 1.601
• CAS DataBase Reference: dioxyphthalic acid(CAS DataBase Reference)
• NIST Chemistry Reference: dioxyphthalic acid(1203-40-3)
• EPA Substance Registry System: dioxyphthalic acid(1203-40-3)

Safety Data

• Hazardous Substances Data: 1203-40-3(Hazardous Substances Data)

Usage

General Description

Dioxyphthalic acid, also known as pyromellitic acid, is a chemical compound with the molecular formula C8H6O6. It is a white crystalline powder that is insoluble in water and is primarily used in the production of high performance polymers such as polyimides and polyesters. Dioxyphthalic acid is also used as a crosslinking agent in the synthesis of advanced materials and as a raw material for the production of specialty chemicals. It is known for its high thermal stability, excellent heat resistance, and good mechanical properties, making it a valuable component in a wide range of industrial applications.

InChI:InChI=1/C8H6O6/c9-7(13-11)5-3-1-2-4-6(5)8(10)14-12/h1-4,11-12H

Upstream product

• 85-44-9 phthalic anhydride 

Relevant articles and documents

Process for steroid preparation

A process for the preparation of a compound of the formula STR1 wherein R1 is selected from the group consisting of hydrogen, alkyl of 1 to 4 carbon atoms optionally substituted by halogen or a nitrogen or oxygen function and alkenyl and alkynyl of 2 to 4 carbon atoms, R2 is alkyl of 1 to 4 carbon atoms and the A, B, C and D rings are optionally substituted by at least one member of the group consisting of optionally protected --OH or =0, halogen, alkyl and alkoxy of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms comprising reacting a compound of the formula STR2 wherein R1 and R2 and the A, B, C and D rings are defined as above with an oxidizing agent in the presence of water and an at least partially water-miscible solvent to obtain a compound of the formula STR3 wherein R1 and R2 and the A, B, C and D rings are defined as above, subjecting the latter to a solvolysis in a basic or acidic media and optionally subjecting the product to a deprotection reaction of any protected --OH or =0 groups to obtain the compound of formula I and novel intermediates.

7-Oxa steroids

7-Oxa steroids which may be substituted in the 3-position with a hydroxy or oxo group or in the 2-position with a hydroxymethylene group or in the 2- and 3-positions with a substituent that forms a 5-membered heterocyclic ring, useful as antigonadotropic agents and a method of preparing these 7-oxa steroids from 3-hydroxy Δ5 -steroids including intermediates in this process.