Benzene-1,2,4,5-tetracarboxylic dianhydride

See also Pyromellitic acid.) [PHTTiALIC ACID AND OTTiERBENZENEPOLYCARBOXYLIC ACIDS] (Vol 18) Benzene-1,2,4,5-tetracarboxylic dianhydride-3-carboxylic acid [59025-58-0]... 

Foster, R., Iball, J., Scrimgeour, S. N., and Williams, B. C. Crystal structure and nuclear magnetic resonance spectra of a 1 1 complex of benz[ a ]anthracene and pyromellitic dianhydride (benzene-1,2,4,5-tetracarboxylic dianhydride). J. Chem. Soc., Perkin Trans. II, 682-685 (1976). 

Benzene-1,2,4,5-tetracarboxylic dianhydride 1,2,4,5-Benzenetetracarboxylic dianhydride 1,2,4,5-Benzenetetracarboxylic 1,2 4,5 dianhydride. See Pyromellitic dianhydride... 

Pyromellitic acid anhydride Pyromellitic anhydride. See Pyromellitic dianhydride Pyromellitic dianhydride CAS 89-32-7 EINECS/ELINCS 201-898-9 Synonyms Benzene-1,2,4,5-tetracarboxylic dianhydride 1,2,4,5-Benzenetetracarboxylic dianhydride 1,2,4,5-Benzenetetracarboxylic 1,2 4,5 dianhydride 1H,3H-Benzo(1,2-c 4,5-c ) difuran-1,3,5,7-tetrone PM DA Pyromellitic acid anhydride Pyromellitic anhydride... 

In a different smdy, they synthesized another five series of poly(ether imide)s based on five different cardo moiety containing diamines, designated as BPI, BAPA, FBP, BIDA, and SBPDA, as presented in Scheme 3.21. Five different aromatic dianhydride, 4,4 -(4,4 -isopropylidenediphenoxy) w(phthalic anhydride) (BPADA), 4,4 -(hexafluoro-isopropyli-dene) diphthalic anhydride (6-FDA), 3,3 4,4"-benzo-phenone tetracarboxylic acid dianhydride (BTDA), 4,4 -oxydiphthalic anhydride (ODPA), and benzene-1,2,4,5-tetracarboxylic dianhydride (PMDA), were used to prepare each series of poly(ether imide)s. The O2-N2 and CO2-CH4 separation properties for... 

Poly(metal phthalocyanine)imide copolymers are produced from the reaction of metal (II) 4,4, 4",4" -phthalocyanine tetramine (Cu, Co, Ni), diamines 4-phenyl-ene, 4,4 -bis(4-aminophenyl)methane, 9,9 -bis(4-aminophenylfluorene) and 1,2,4,5-benzene tetracarboxylic dianhydride [69]. 

Samples stored at 50% RH for one week BTCD= 1,2,4,5-benzene tetracarboxylic dianhydride... 

The checkers isolated 167 g. of crude anhydride mixture boiling at 70-125°/3 mm. The large tarty residue contains allene polymers and small amounts of 1,2,3,4,5,6,7,8-octahydronaph-thalene 2,3,6,7-tetracarboxylic dianhydride, which can be recovered by diluting the residue with benzene and filtering. 

Two polymers have been prepared with the benzophenone tetracarboxylic dianhydride (BTDA) and either bis-l,3-(4-aminophenoxy)-benzene or bis-l,3-(4-aminophenoxy)-2-cyano-benzene (Fig. 5.6). Both polymers are soluble in NMP and their Tg values are respectively 191 and 243°C.59... 

The key to acetylene terminated polyimides is the availability of the end-capper which carries the acetylene group. Hergenrother (130) published a series of ATI resins based on 4-ethynylphthalic anhydride as endcapping agent. This approach first requires the synthesis of an amine-terminated amide acid prepolymer, by reacting 1 mole of tetracarboxylic dianhydride with 2 moles of diamine, which subsequently is endcapped with 4-ethynylphthalic anhydride. The imide oligomer is finally obtained via chemical cyclodehydration. The properties of the ATI resin prepared via this route are not too different from those prepared from 3-ethynylaniline as an endcapper. When l,3-bis(3-aminophenox)benzene was used as diamine, the prepolymer is completely soluble in DMAc or NMP at room temperature, whereas 4,4 -methylene dianiline and 4,4 -oxydianiline based ATIs were only partially soluble. The chemical structure of ATIs based on 4-ethynylphthalic anhydride endcapper is shown in Fig. 45. 

Starting materials and solvents were purchased from Aldrich Chemical Co. acetonitrile (ACN), N,N-dimethylformamide (DMF), and N-methyl-2-pyrrolidone (NMP) were obtained anhydrous in Sure/Seal bottles and used as received. The polyamic acid of PMDA-ODA (2545 Pyralin) was supplied by DuPont. The soluble polyimide XU-218, derived from 3,3, 4,4 -benzophenone tetracarboxylic dianhydride (BTDA) and diamino-1,1,3-trimethyl-3-phenylindan isomers (DAPI) was purchased from Ciba-Geigy Corp. The acetylene terminated imide oligomer powder (Thermid MC-600) derived from BTDA, aminophenylacetylene, and 1,3-bis (2-aminophenoxy) benzene (APB) was obtained from National Starch and Chemical Company. Kapton Type II (PMDA-ODA) films were obtained from DuPont Co., Apical polyimide films were obtained from Allied Corp., and Upilex Type-S and Type-R polyimide films derived from 3,3, 4,4 -biphenyl tetracarboxylic dianhydride (BPDA) plus p-phenylenediamine (PDA) and ODA, respectively were obtained from ICI Americas Inc. 

Benzene-l,2,4,5-tetracarboxylic dianhydride (pyromellitic dianhydride) [89-32-7] M 218.1, m 286 , b 397-400 /760mm. Crystalhse the dianhydride from ethyl methyl ketone or dioxane. Dry, and sublime it in vacuo. [Beilstein 19 H 196,19/5 V 407.]... 

PETI-5 3,4 -Oxydianiline, 1,3-bis (3-amino phenoxy benzene) and 3,3, 4,4 -biphenyl tetracarboxylic dianhydride encapped with 4-phenylethynyl pthalic anhydride Phenyl ethynyl 270/250 [141-143]... 

Dry benzene (260 mL) was added to the pseudoacid chloride followed by 56 g (0.42 mol) of aluminum chloride. The mixture was heated at reflux until the evolution of hydrogen chloride ceased. After being cooled, the aluminum chloride complex was destroyed with 6 N hydrochloric acid. The benzene layer was extracted with 5% sodium bicarbonate and dried over sodium sulfate. The benzene was removed under vacuum, and the residue was recrystallized from acetone/water to give 32 g (13% based on tetracarboxylic dianhydride) of bis(3,3-diphenyl-6-phthalidyl) ketone, m.p. 238-39 C. 

Abstract Three series of new polyimides were prepared by condensation of imidazole-blocked 2,5-bis(n-alkoxymethyl)-1,4-benzene diisocyanates with pyromellitic dianhydride (PMDA), benzophenone tetracarboxylic dianhydride (BPDA), and naphthalene tetracarboxylic dianhydride (NTDA), respectively. After the polymers obtained were spectroscopically characterized, their solubilities, thermal properties and crystalline structures were measured and discussed. It was found that structures and properties of the polyimides having regularly substituted n-alkoxymethyKn-CHjOC Hj j, m=4,6,8) side branches are governed not only by side chain length, but also by main chain rigidity. 

Example the source-based name poly[(benzene-l,2,4,5-tetracarboxylic 1,2 4,5-dianhydride)-a/t-(4,4 -oxydianiline)] is ambiguous ambiguity about the structure is removed by writing poly(amide-acid) [(benzene-1,2,4,5-tetracarboxylic 1,2 4,5-dianhydride)-a/t-(4,4 -oxydianiline)] to accompany the graphical structure-based representation... 

Polyimides based on l-amino-3-phenoxy-5-(4-aminophenoxy)-benzene and snch dianhydrides as dianhydride of diphenyloxide-3,3 4,4 -tetracarboxylic acid, dianhydride A and dianhydride 6F are soluble in NMP, dimethylformamide (DMF), w-cresol, THF and chloroform. The polyimide based on benzophenone-3,3, 4,4 -tetracarboxylic acid dianhydride is partially soluble in w-cresol and NMP it is insoluble in chloroform, THF and DMF. Polypyromellitimide is insoluble in all the solvents tested. 

Low molecular weight phthalocyanines are prepared by cyclotetramerization of unsubstituted or substituted phthalic acid derivatives such as phthalonitrile in the presence of suitable metals. If bifunetional tetracarbonitriles are employed, polymeric phthalocyanines 56 and 57 are obtained [equations (22) and (23)] 1,2,4,5-tetracyano-benzene, oxyalkyleneoxy-, oxyaryleneoxy- [239-242], tetrathio- or dioxadithia-bridged [243], bisphthalonitriles and tetracarboxylic acid derivatives such as 1,2,4,5-benzenetetra-carboxylic acid dianhydride [244-246]. The reactions of the carbonitriles were carried out in bulk in the presence of a metal at T= 200-400 °C. Dark-blue till black-coloured polymers insoluble in any organic solvent were obtained. Recently the synthesis of the... 

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