1.2.4- benzenetricarboxylic acid anhydride

Synonyms Anhydrotrimellitic acid 1,2,4-benzenetricarboxylic acid anhydride 1,3-dihydro-1,3 -dioxo-5 -isobenzofurancarboxylic acid TMA TMAN (preferred)... 

Esters of trimellitic (1,2,4-benzenetricarboxylic acid) anhydride provide excellent resistance to volatile loss and oxidation under heat ageing conditions making them the material of choice in applications for which high-temperature thermal stability is required. Insulation for automotive and aircraft cables are typical areas of application. The low volatility of trimellitates is also exploited in car interior components. 

Synthesis of phthalocyanine-2,9,16,23-tetracarboxylic acid cobalt(II) complex 48 (R = -COOH M = Co(II)) 0.26 g (2 mmol) water-free cobalt chloride, 1.54 g (8 mmol) 1,2,4-benzenetricarboxylic acid anhydride, 4.8 g (80 mmol) urea and around 20 mg ammonium molybdate are intensively mixed and heated under inert gas in a 100-mL glass vessel at 270 °C for 1 h. The blue-colored reaction mixture was pulverized, stirred in 400 mL 6 M aqueous HCl, filtered, intensively washed with 6 M HCl and then water and acetone. The product was treated in a Soxhlet apparatus with acetone and dried. The phthalocyanine tetracarboxylic acid amide obtained was saponified to the tetracarboxylic acid as follows. 1 g of the tetracarboxylic acid amide was heated in a mixture of 6 g KCl and 15 mL 2 M aqueous KOH at 90 °C until the ammonia evolution became weak. The filtered product was dissolved in a fairly small amount of 2 M NaOH and after filtration from byproducts separated with 2 M HCl and isolated by centrifugation. Purification was achieved by dissolving in 0.05 M NaOH, separation with 2 M HCl and centrifugation until the filtrate is free of chloride ions. Yield from 1 g tetracarboxylic acid amide 0.56 g (38%). IR (KBr) 1698, 1373, 1326, 1150, 1091, 743 cm . 

Benzenetricarboxylic acid anhydride 1,2,4-Benzenetricarboxylic acid-1,2-anhydride 1,2,4-Benzenetricarboxylic acid, cyclic 1,2-anhydride. See Trimellitic anhydride... 

CAS 552-30-7 EINECS/ELINCS 209-008-0 Synonyms Anhydrotrimellitic acid 1,2,4-Benzenetricarboxylic acid anhydride 1,2,4-Benzenetricarboxylic acid-1,2-anhydride 1,2,4-Benzenetti-carboxylic acid, cyclic 1,2-anhydride Benzene-1,2,4-tricarboxylic anhydride 4-Carboxyphthalic anhydride 1,3-Dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid 1,3-Dioxo-1,3-dihydroisobenzofuran-5-carboxylic acid 1,3-Dioxo-5-phthalanccarboxylic acid Diphenylmeth-ane-4,4 -diisocyanate trimellic anhydride TMA Trimellic acid anhydride Trimellic acid-1,2-anhydride Trimellitic acid cyclic-1,2-anhydride Empirical C9FI4OS Formula FIOCOCsFIsCOOCO... 

BENZENEDIAZOSULFONIC ACID, p-(DIMETHYLAMINO)-, SODIUM SALT 1,2,4-BENZENETRICARBOXYLIC ACID 1,2-ANHYDRIDE... 

SYNS ANHYDROTRIMELLIC ACID 1,2,4-BENZ-ENETRICARBOXYLIC ACID ANHYDRIDE 1,2,4-BENZENETRICARBOXYLIC ACID, CYCLIC 1,2-ANHYDRIDE 1,2,4-BENZENETRICARBOXYLIC ANHYDRIDE 4-CARBOXYPHTHALIC ANHYDRIDE l,3-DIHYDRO-l,3-DIOXO-5-ISOBENZOFURANCARBOX-YXIC ACID l,3-DIOXO-5-PHTHAL. NCARBOXYLIC ACID DIPHENYLMETHANE-4,4 -DIISOCYANATE-TRIMELLIC ANHYDRIDE-ETHOMID HT POLYMER NCI-C56633 TMA TMAN TRIMELLIC ACID ANHYDRIDE TRIMELLIC ACID-1,2-ANHYDRIDE TRIMELLITIC ACID CYCLIC-1,2-ANHYDRIDE... 

Poly(sebacic anhydride) branched with 1,3,5 benzenetricarboxylic acid... 

Benzenetricarboxylic acid 1,2-anhydride, 4-chloride 4-(Chloroiormyl)phthalic anhydride C9H3C10, 1204-28-0 210.671 66 ... 

Synonyms/Trade Names 1,2,4-Benzenetricarboxylic anhydride 4-Carboxyphthalic anhydride TMA THAN Trimeiiic acid anhydride [Note TMA is aiso a synonym for Trimethyiamine.] ... 

Benzenetricarboxylic acid, cyclic 1,2-anhydride. See Trimellitic anhydride... 

---