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1,2,4,5-Benzenetetracarboxylic anhydride

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Name

1,2,4,5-Benzenetetracarboxylic anhydride

EINECS 201-898-9
CAS No. 89-32-7 Density 1.885 g/cm3
PSA 94.56000 LogP -0.50460
Solubility decomposes in water Melting Point 283-286 °C(lit.)
Formula C10H2O6 Boiling Point 398.6 °C at 760 mmHg
Molecular Weight 218.12 Flash Point 183.5 °C
Transport Information Appearance White powder
Safety 22-24-26-37/39 Risk Codes 41-42/43
Molecular Structure Molecular Structure of 89-32-7 (1,2,4,5-Benzenetetracarboxylic anhydride) Hazard Symbols HarmfulXn
Synonyms

1,2,4,5-Benzenetetracarboxylic1,2:4,5-dianhydride (8CI);Pyromellitic 1,2:4,5-dianhydride (6CI);1,2,4,5-Benzenetetracarboxylic acid 1,2:4,5-dianhydride;1,2,4,5-Benzenetetracarboxylic acid dianhydride;1,2:4,5-Benzenetetracarboxylicdianhydride;NSC 4798;PMDA;PMDA-M;Pyromellitic acid anhydride;Pyromelliticacid dianhydride;Pyromellitic anhydride;Pyromellitic dianhydride;

 

1,2,4,5-Benzenetetracarboxylic anhydride Synthetic route

89-05-4

1,2,4,5-benzenetetracarboxylic acid

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
With acetic anhydride for 3h; Reflux;97%
With 2,6-bis[(2,2,6,6-tetramethylpiperidin-1-yl)methyl]phenylboronic acid In propyl cyanide for 12h; Reflux;90%
2,6-bis[(2,2,6,6-tetramethylpiperidin-1-yl)methyl]phenylboronic acid In butryonitrile for 12h; Reflux;90%
95-93-2

1,2,4,5-tetramethylbenzene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
at 450 - 565℃; Leiten im Gemisch mit Luft ueber Vanadium(V)-oxid;
With oxygen at 398℃; Gas phase;
39144-22-4

1,4-diethyl-2,5-dimethyl-benzene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
at 450 - 565℃; Leiten im Gemisch mit Luft ueber Vanadium(V)-oxid;
517-60-2

benzenehexacarboxylic acid

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
durch trockne Destillation;
5999-20-2

4,5-dimethylphthalic anhydride

A

85-44-9

phthalic anhydride

B

19438-61-0

4-methylphthalic anhydride

C

4792-30-7

3-methylphthalic acid anhydride

D

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
With vanadia at 400℃; Product distribution; effect of temperature on gas-phase oxidation;
6051-66-7

2,5-dimethylterephthalic acid

A

108-31-6

maleic anhydride

B

89-32-7

Pyromellitic dianhydride

C

528-44-9

1,2,4-benzene tricarboxylic acid

D

552-30-7

trimellitic Anhydride

Conditions
ConditionsYield
With vanadia at 400℃; Product distribution; effect of temperature on gas-phase oxidation;
18190-63-1

2,4-dimethylisophthalic acid

A

89-32-7

Pyromellitic dianhydride

B

528-44-9

1,2,4-benzene tricarboxylic acid

C

552-30-7

trimellitic Anhydride

Conditions
ConditionsYield
With vanadia at 400℃; Product distribution; effect of temperature on gas-phase oxidation of methyl-substituted carboxylic acids and anhydrides;
benzenepentacarboxylic acid-dianhydride-(1.2;4.5)

benzenepentacarboxylic acid-dianhydride-(1.2;4.5)

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
at 270 - 300℃;
1585-40-6

benzenepentacarboxylic acid

A

124-38-9

carbon dioxide

B

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
at 270 - 300℃;
517-60-2

benzenehexacarboxylic acid

A

124-38-9

carbon dioxide

B

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
bei der trocknen Destillation;
95-93-2

1,2,4,5-tetramethylbenzene

A

89-05-4

1,2,4,5-benzenetetracarboxylic acid

B

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Stage #1: 1,2,4,5-tetramethylbenzene With oxygen; acetic acid; cobalt(II) acetate; manganese(II) acetate; 2,6-dihydroxypyrrolo[3,4-f]isoindolo-1,3,5,7(2H,6H)tetrone In water at 120℃; under 30003 Torr; for 2h;
Stage #2: With acetic anhydride In water at 120 - 150℃; under 3750.38 - 30003 Torr; for 4h; Product distribution / selectivity;
119-64-2

tetralin

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: aluminium chloride / 50 - 70 °C
2: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
3: 290 °C / 13 Torr
View Scheme
Multi-step reaction with 8 steps
1: phosphorus pentoxide / 190 °C
3: 130 - 140 °C
4: amalgamated zinc; hydrochloric acid
5: phosphorus pentachloride / nachfolgend Destillation im Vakuum
6: amalgamated zinc; concentrated hydrochloric acid
7: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
8: 290 °C / 13 Torr
View Scheme
85-01-8

phenanthrene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1: nickel catalyst; tetralin / 200 - 220 °C / Hydrogenation
2: aluminium chloride / 80 °C
3: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
4: 290 °C / 13 Torr
View Scheme
120-12-7

anthracene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: nickel catalyst; tetralin / 180 - 200 °C / Hydrogenation
2: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
3: 290 °C / 13 Torr
View Scheme
5440-71-1

3,4,5,6,7,8-hexahydro-1(2H)-anthracenone

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: amalgamated zinc; concentrated hydrochloric acid
2: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
3: 290 °C / 13 Torr
View Scheme
1079-71-6

1,2,3,4,5,6,7,8-octahydroanthracene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
2: 290 °C / 13 Torr
View Scheme
5325-97-3

1,2,3,4,5,6,7,8-Octahydrophenanthrene

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: aluminium chloride / 80 °C
2: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
3: 290 °C / 13 Torr
View Scheme
5803-67-8

2-chloro-1-(5,6,7,8-tetrahydro-naphthalen-2-yl)-ethanone

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 7 steps
2: 130 - 140 °C
3: amalgamated zinc; hydrochloric acid
4: phosphorus pentachloride / nachfolgend Destillation im Vakuum
5: amalgamated zinc; concentrated hydrochloric acid
6: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
7: 290 °C / 13 Torr
View Scheme
782-27-4

4-(5,6,7,8-tetrahydronaphthalen-2-yl)butanoic acid

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1: phosphorus pentachloride / nachfolgend Destillation im Vakuum
2: amalgamated zinc; concentrated hydrochloric acid
3: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
4: 290 °C / 13 Torr
View Scheme
871893-92-4

[2-oxo-2-(5,6,7,8-tetrahydro-[2]naphthyl)-ethyl]-malonic acid

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1: 130 - 140 °C
2: amalgamated zinc; hydrochloric acid
3: phosphorus pentachloride / nachfolgend Destillation im Vakuum
4: amalgamated zinc; concentrated hydrochloric acid
5: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
6: 290 °C / 13 Torr
View Scheme
785-17-1

4-oxo-4-(5,6,7,8-tetrahydronaphthalen-2-yl)butanoic acid

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1: amalgamated zinc; hydrochloric acid
2: phosphorus pentachloride / nachfolgend Destillation im Vakuum
3: amalgamated zinc; concentrated hydrochloric acid
4: bei aufeinanderfolgender Oxydation mit sodaalkalischer und mit schwefelsaurer Permanganat-Loesung
5: 290 °C / 13 Torr
View Scheme
89-05-4

1,2,4,5-benzenetetracarboxylic acid

34240-10-3

5-methyl-1,2,4-benzenetricarboxylic acid

528-44-9

1,2,4-benzene tricarboxylic acid

88-99-3

benzene-1,2-dicarboxylic acid

A

methyltrimellitic anhydride

B

89-32-7

Pyromellitic dianhydride

C

2479-49-4

3,3',4,4'-benzophenonetetracarboxylic acid

D

7487-10-7

pyromellitic acid monoanhydride

Conditions
ConditionsYield
Stage #1: 1,2,4,5-benzenetetracarboxylic acid; 5-methyl-1,2,4-benzenetricarboxylic acid; 1,2,4-benzene tricarboxylic acid; benzene-1,2-dicarboxylic acid at 235 - 250℃; for 7.5 - 30h;
Stage #2: With acetic anhydride In acetic acid at 120 - 170℃; under 750.075 - 4500.45 Torr; Product distribution / selectivity;
1036648-76-6

2,4,5-tris(ethoxycarbonyl)benzoic acid

A

1036648-79-9

diethyl 1,3-dioxo-1,3-dihydroisobenzofuran-5,6-dicarboxylate

B

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
Heating;A 31.8 g
B n/a
89-05-4

1,2,4,5-benzenetetracarboxylic acid

108-24-7

acetic anhydride

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
for 2h; Reflux;

C22H20CuN4O4(2+)*C10H2O8(4-)*2H(1+)

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
at 20 - 180℃; for 4h;
18779-88-9

1,1'-(1,2-ethanediyl)bis-(2,4,5-trimethylbenzene)

89-32-7

Pyromellitic dianhydride

Conditions
ConditionsYield
With air; V2O5-TiO2-P2O5 catalyst at 380℃; Temperature;
89-32-7

Pyromellitic dianhydride

74-89-5

methylamine

26011-79-0

N,-N'-Dimethylpyromellitic acid diimide

Conditions
ConditionsYield
at 160℃; under 600.048 Torr; Condensation; solid-gas reaction;100%
89-32-7

Pyromellitic dianhydride

74-89-5

methylamine

pyromellitic tetramethylamide

Conditions
ConditionsYield
under 750.06 Torr; Condensation; solid-gas reaction; ring cleavage;100%
439385-19-0

[(m-aminophenylamino)-4-aminophenylmethylidene]propanedinitrile

89-32-7

Pyromellitic dianhydride

polyimide; monomer(s): [(m-aminophenylamino)-4-aminophenylmethylidene]propanedinitrile; pyromellitic dianhydride

polyimide; monomer(s): [(m-aminophenylamino)-4-aminophenylmethylidene]propanedinitrile; pyromellitic dianhydride

Conditions
ConditionsYield
In 1-methyl-pyrrolidin-2-one; chlorobenzene at 20 - 190℃;100%
89-32-7

Pyromellitic dianhydride

C8H2O3

Conditions
ConditionsYield
With calcium fluoride at -266.46℃; Photolysis;100%

5-(4-aminophenyl)-10,15,20-tris(3,5-di-tert-butylphenyl) porphyrin

89-32-7

Pyromellitic dianhydride

79098-13-8

4-hexadecylaniline

557-34-6

zinc diacetate

303955-50-2

[Zn(C20H8N4((C4H9)2C6H3)3(C6H4)(C10H2N2O4)(C6H4)(C16H33))]

Conditions
ConditionsYield
In N,N-dimethyl-formamide (C20H10N4((C4H9)2C6H3)3(C6H4))NH2, C10H2O6, (C16H33)NH(C6H5) (dry DMF) heated under N2 in dark for 22 h, cooled to 25°C, evapd. to dryness (reduced pressure); chromy., dissolved (CHCl3), added Zn(OAc)2 in CH3OH, heated for 30 min; washed twice (H2O), dried (anhydrous Na2SO4), solvent evapd., chromy., reprecipitated from chloroform-methanol;100%
89-32-7

Pyromellitic dianhydride

122-51-0

orthoformic acid triethyl ester

6634-01-1

1,2,4,5-benzenetetracarboxylic acid ethyl ester

Conditions
ConditionsYield
Stage #1: Pyromellitic dianhydride; orthoformic acid triethyl ester
Stage #2: With water
100%
In ethanol for 4.5h; Heating;99.2%

4,4'-diaminodiphenyl ether-d8

89-32-7

Pyromellitic dianhydride

poly[deuterated 4,4'-diaminodiphenyl ether-co-pyromellitic dianhydride]

poly[deuterated 4,4'-diaminodiphenyl ether-co-pyromellitic dianhydride]

Conditions
ConditionsYield
In 1-methyl-pyrrolidin-2-one at 25℃; for 2h;100%
89-32-7

Pyromellitic dianhydride

106-50-3

1,4-phenylenediamine

C10H6O8*C6H8N2

Conditions
ConditionsYield
Stage #1: Pyromellitic dianhydride In water at 80℃; for 1h; Inert atmosphere;
Stage #2: 1,4-phenylenediamine In water at 80℃; for 4h; Inert atmosphere;
100%
89-32-7

Pyromellitic dianhydride

149-73-5

trimethyl orthoformate

635-10-9

tetramethyl 1,2,4,5-benzenetetracarboxylate

Conditions
ConditionsYield
In methanol for 7.5h; Heating;99.9%
89-32-7

Pyromellitic dianhydride

2550-73-4

pyrrolo[3,4-f]isoindole-1,3,5,7-tetraone

Conditions
ConditionsYield
With urea In N,N-dimethyl-formamide for 0.0666667h; microwave irradiation;99%
With choline chloride; urea at 140℃; for 1h; Green chemistry;97%
With formamide for 0.0333333h; microwave irradiation;96%
89-32-7

Pyromellitic dianhydride

999-97-3

1,1,1,3,3,3-hexamethyl-disilazane

2,6-bis-trimethylsilanyl-pyrrolo[3,4-f]isoindole-1,3,5,7-tetraone

Conditions
ConditionsYield
at 130 - 140℃;99%
89-32-7

Pyromellitic dianhydride

65615-90-9

(S)-methyl 3-(4-aminophenyl)-2-((tert-butoxycarbonyl)amino)propanoate

C40H42N4O12

Conditions
ConditionsYield
Stage #1: Pyromellitic dianhydride; (S)-methyl 3-(4-aminophenyl)-2-((tert-butoxycarbonyl)amino)propanoate With N,N-dimethyl acetamide at 20℃; for 22h; Inert atmosphere;
Stage #2: With acetic anhydride; triethylamine at 80℃; for 2.5h; Inert atmosphere;
98.3%
89-32-7

Pyromellitic dianhydride

76660-17-8

pyromellitic diimide.formamide

Conditions
ConditionsYield
at 210℃; for 0.25h;98%
1583-76-2

2-(2,3,4,5,6-pentafluorophenyl)ethan-1-amine

89-32-7

Pyromellitic dianhydride

1206633-77-3

N,N'-di(2-(perfluorophenyl)ethyl)pyromellitic diimide

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 110℃;98%
61-90-5

L-leucine

89-32-7

Pyromellitic dianhydride

144443-35-6

N,N-(pyromellitoyl)-bis-L-leucine

Conditions
ConditionsYield
With pyridine; acetic acid Reflux;98%
With acetic acid Reflux;
With acetic acid at 20℃; for 13h; Reflux;
63-91-2

L-phenylalanine

89-32-7

Pyromellitic dianhydride

144443-37-8

N,N’-(pyromellitoyl)-bis-L-phenylalanine diacid

Conditions
ConditionsYield
With pyridine; acetic acid Reflux;98%
With dmap In N,N-dimethyl-formamide at 140℃; for 0.166667h; Reagent/catalyst; Solvent; Sealed tube; Microwave irradiation;87%
In acetic acid at 20℃; Reflux;86%
89-32-7

Pyromellitic dianhydride

1356860-81-5

C18H31N3O

1356860-83-7

(C5H4NCH2NHCO(CH2)11)2C10H2N2O4

Conditions
ConditionsYield
Heating;98%
13325-10-5

4-Aminobutanol

89-32-7

Pyromellitic dianhydride

64-19-7

acetic acid

C22H24N2O8

Conditions
ConditionsYield
for 19h; Reflux;98%
89-32-7

Pyromellitic dianhydride

89-05-4

1,2,4,5-benzenetetracarboxylic acid

Conditions
ConditionsYield
With water for 4h; Reflux;96.6%
With water
With alkali
With water at 80℃; Inert atmosphere;
64-17-5

ethanol

89-32-7

Pyromellitic dianhydride

6634-01-1

1,2,4,5-benzenetetracarboxylic acid ethyl ester

Conditions
ConditionsYield
With sulfuric acid Reflux; Molecular sieve;96%
With sulfuric acid at 100℃; for 4h;68%
Stage #1: ethanol; Pyromellitic dianhydride for 2h; Reflux;
Stage #2: With sulfuric acid for 18h; Reflux;
64%
With sulfuric acid In benzene
With sulfuric acid
89-32-7

Pyromellitic dianhydride

39895-56-2

4-hydroxymethyl-benzylamine

944247-89-6

C26H20O6N2

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 20 - 140℃; for 4.5h;96%
In N,N-dimethyl-formamide at 20 - 140℃;96%
1003601-35-1

4,4'-bis[4-(4-amino-3-methylphenoxy)benzenesulfonyl]biphenyl

89-32-7

Pyromellitic dianhydride

160038-77-7

4,4'-bis[4-(3-aminophenoxy)benzenesulfonyl]biphenyl

polyimide, Mn = 54000, Mw = 87000; monomer(s): 4,4'-bis[4-(4-amino-3-methylphenoxy)benzenesulfonyl]biphenyl; pyromellitic dianhydride

polyimide, Mn = 54000, Mw = 87000; monomer(s): 4,4'-bis[4-(4-amino-3-methylphenoxy)benzenesulfonyl]biphenyl; pyromellitic dianhydride

Conditions
ConditionsYield
Stage #1: 4,4'-bis[4-(4-amino-3-methylphenoxy)benzenesulfonyl]biphenyl; Pyromellitic dianhydride; 4,4'-bis[4-(3-aminophenoxy)benzenesulfonyl]biphenyl In N,N-dimethyl acetamide at 20℃; for 20h;
Stage #2: at 120 - 250℃; for 1.16667h; Further stages.;
96%

4,4'-diaminodiphenylmethane-d10

89-32-7

Pyromellitic dianhydride

poly[deuterated 4,4'-diaminodiphenylmethane-co-pyromellitic dianhydride]

poly[deuterated 4,4'-diaminodiphenylmethane-co-pyromellitic dianhydride]

Conditions
ConditionsYield
In 1-methyl-pyrrolidin-2-one at 25℃; for 2h;96%
In 1-methyl-pyrrolidin-2-one at 25℃; for 2h;95%
89-32-7

Pyromellitic dianhydride

500148-54-9

2-hydrazino-3-(p-chlorophenyl)-1,8-naphthyridine

1550370-33-6

C38H20Cl2N8O4

Conditions
ConditionsYield
With N,N-dimethyl-formamide for 0.05h; Microwave irradiation;96%
89-32-7

Pyromellitic dianhydride

3646-50-2

3-Amino-3-phenylpropionic acid

1133768-70-3

2,6-bis(3-hydroxy-3-oxo-1-phenylprop-1-yl)pyrrolo[3,4-f]isoindole-1,3,5,7(2H,6H)-tetraone

Conditions
ConditionsYield
In nitrobenzene at 155 - 165℃; for 1h;95%
18612-28-7

3-hydrazinyl-oxo-N-(1,3-thiazole-2-yl)-propanamide

89-32-7

Pyromellitic dianhydride

1145681-95-3

N-{1,3,5,7-tetraoxo-6-[2-(thiazol-2-ylcarbamoyl)acetylamino]-3,5,6,7-tetrahydro-1H-pyrrolo[3,4-f]isoindol-2-yl}-N'-thiazol-2-yl-malonamide

Conditions
ConditionsYield
With acetic acid for 6h; Reflux;95%
89-32-7

Pyromellitic dianhydride

1583-88-6

4-fluoro-2-phenethylamine

346634-46-6

N,N'-di(2-(4-fluorophenyl)ethyl)pyromellitic diimide

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 110℃;95%
89-32-7

Pyromellitic dianhydride

123-30-8

4-amino-phenol

14027-98-6

N,N'-(pyromellitoyl)-bis-p-aminophenol

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 20℃; for 12h; Reflux;95%

1,2,4,5-Benzenetetracarboxylic anhydride Chemical Properties

IUPAC Name: Furo[3,4-f][2]benzofuran-1,3,5,7-tetrone
Molecular Formula: C10H2O6
Molecular Weight: 218.119280 g/mol
Appearance: White powder
Melting Point: 283-286 °C(lit.)
Boiling Point: 397-400 °C(lit.)
Flash Point: 380 °C
Density: 1,68 g/cm3   
Water Solubility: Decomposes
Sensitive: Moisture Sensitive
Structure of 1,2,4,5-Benzenetetracarboxylic anhydride (CAS NO.89-32-7):
                          
Product Category of 1,2,4,5-Benzenetetracarboxylic anhydride (CAS NO.89-32-7): Intermediates of Dyes and Pigments;Benzene derivates;Functional Materials;Reagent for High-Performance Polymer Research

1,2,4,5-Benzenetetracarboxylic anhydride Uses

 1,2,4,5-Benzenetetracarboxylic anhydride (CASNO.89-32-7) is used for making polyimide resin, high temperature electrical insulating paint, PVC plasticizers, cross-linking agent of synthetic resin and curing agent of epoxy resin.

1,2,4,5-Benzenetetracarboxylic anhydride Toxicity Data With Reference

1.    

orl-rat LD50:2250 mg/kg

    GISAAA    Gigiena i Sanitariya. 51 (11)(1986),79.
2.    

ihl-rat LCLo:150 mg/m3/4H

    85GMAT    Toxicometric Parameters of Industrial Toxic Chemicals Under Single Exposure Izmerov, N.F., et al.,Moscow, USSR.: Centre of International Projects, GKNT,1982,105.
3.    

orl-mus LD50:2400 mg/kg

    TPKVAL    Toksikologiya Novykh Promyshlennykh Khimicheskikh Veshchestv. Toxicology of New Industrial Chemical Sciences. 14 (1975),125.
4.    

orl-gpg LD50:1595 mg/kg

    GISAAA    Gigiena i Sanitariya. 51 (11)(1986),79.

 1,2,4,5-Benzenetetracarboxylic anhydride (CAS NO.89-32-7) hasn't been listed as a carcinogen by NTP, IARC, ACGIH, or CA Prop 65. You can see actual entry in RTECS for complete information.

1,2,4,5-Benzenetetracarboxylic anhydride Consensus Reports

Reported in EPA TSCA Inventory.

1,2,4,5-Benzenetetracarboxylic anhydride Safety Profile

Poison by inhalation. Moderately toxic by ingestion. When heated to decomposition it emits acrid smoke and irritating vapors.
Hazard Codes: Xn 
Risk Statements: 41-42/43
41:Risk of serious damage to eyes
42/43:May cause sensitization by inhalation and skin contact   
Safety Statements: 22-24-26-37/39
22:Do not breathe dust   
24:Avoid contact with skin  
26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
37/39:Wear suitable gloves and eye/face protection 

1,2,4,5-Benzenetetracarboxylic anhydride Specification

 1,2,4,5-Benzenetetracarboxylic anhydride , its cas register number is 89-32-7. It also can be called Pyromellitic dianhydride ; Benzene-1,2,4,5-tetracarboxylic dianhydride ; PMDA ; and Pyromellitic acid dianhydride . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition, 1,2,4,5-Benzenetetracarboxylic anhydride (CAS NO.89-32-7) could be stable under normal temperatures and pressures. It is not exposured to moist air or water, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, carbon dioxide.

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