52497-39-9

Upstream product

• 89-32-7 Pyromellitic dianhydride 
• 108-88-3 toluene 

Downstream Products

• 1429225-61-5 4,6-di(4-methylphenyl)-1H,9H[1,2]oxazino[4,5-g][2,3]benzoxazine-1,9-dione 
• 1429225-70-6 4,6-di(4-methylphenyl)pyridazino[4,5g]phthalazine-1,9(2H,8H)dione 
• 503603-69-8 4,6-bis-(4-methyl-benzyl)-isophthalic acid 

Relevant academic research and scientific papers

Synthesis of some new heterocyclic nitrogen compounds starting from pyromellitic dianhydride

Pyromellitic dianhydride 1 was used as starting compound for the synthesis of some new derivatives of condensed dipyrrole, dibenzoxazine, and dipyridazine. Thus, the diimide 2 was formed on fusion of 1 with urea, thiourea and/or thiosemicarbazide. Also, 1 reacted with benzylamine to give terephthalic acid derivative 3 which on fusion afforded the cyclic diimide 4. The reaction of 1 with o-aminothiophenol under different reaction conditions was investigated to give 5 in acetic acid or 6 in toluene and the later could be decarboxylated to 7. On the other hand, the action of AlCl3 on 1 in presence of reactive aromatic substrates afforded the corresponding isomers 8a-d and 9a-d. which could be cyclized using hydroxylamine hydrochloride to give the dioxazine isomers 10a-d and 11a-d. The dioxazine isomers 10b and 11b were also obtained when 14 was allowed to react with AlCl3 in anisol. Cyclization of 8a-d and/or 9a-d using hydrazine or phenylhydrazine gives the dipyridazine isomers 13a-h and/or 14a-f respectively.

Organotin(IV) carboxylates based on benzenedicarboxylic acid derivatives: Syntheses, crystal structures and characterizations

Five organotin carboxylates based on 1,3-benzenedicarboxylic acid and 1,4-benzenedicarboxylic acid derivatives, namely (Ph3Sn) 2(4,6-L1)(H2O)2·(C 2H5OH)·4H2O (1) (4,6-L1 = 4,6-bis(4-methyl-benzoyl)isophthalic acid), (Cy3Sn) 2(4,6-L1)(DMF)2 (2), (Ph3Sn) 2(4,6-L2)(DMF)2 (3) (4,6-L2 = 4,6-dibenzoylisophthalic acid), (Ph3Sn)2(2,5-L 3)(DMF)2 (4) (2,5-L3 = 2,5-bis(4-isopropyl- benzoyl)terephthalic acid) and [(n-Bu2Sn)4(4,6-L 4)O2(OH)(OC2H5)]2· 2(C2H5OH) (5) (4,6-L4 = 4,6-bis(4-ethyl- benzoyl)isophthalic acid), have been synthesized. All the complexes have been characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy and X-ray crystallography diffraction analyses. The structural analysis reveals that complexes 1-3 show similar constructions, containing binuclear triorganotin skeletons based on 1,3-benzenedicarboxylic acid derivatives. Through intermolecular hydrogen bonds and C-H?π interactions, complex 1 demonstrates as a 3D architecture while 2 as a 1D chain and 3 as a 2D network. Complex 4 is a binuclear triorganotin based on 1,4-benzenedicarboxylic acid derivative. With the intermolecular C-H?π interaction, 4 shows a 2D network structure. Complex 5 has a ladder-like octanuclear architecture composed by two Sn4O4 ladders connected by two 1,3-benzenedicarboxylic acid derivatives and form an intramolecular 24-membered macrocycle.

Macrocyclic organotin(IV) carboxylates based on benzenedicarboxylic acid derivatives: Syntheses, crystal structures and antitumor activities

Six new organotin carboxylates based on 1,3-benzenedicarboxylic acid and 1,4-benzenedicarboxylic acid derivatives, namely (Ph3Sn) 2(2,5-L1)(C2H5OH)2 (1) (2,5-H2L1 = 2,5-dibenzoylterephthalic acid), (Ph 3Sn)2(2,5-L2)(C2H 5OH)2 (2) (2,5-H2L2 = 2,5-bis(4-methylbenzoyl)terephthalic acid), (Ph3Sn) 2(2,5-L3)(C2H5OH)2 (3) (2,5-H2L3 = 2,5-bis(4-ethylbenzoyl)terephthalic acid), [(n-Bu2Sn)4(4,6-L1)O2(OH)(OC 2H5)]2·2(C2H5OH) (4) (4,6- H2L1 = 4,6-dibenzoylisophthalic acid), [(n-Bu2Sn)4(4,6-L1)O2(OH)(OC 4H9)]2·2(C4H9OH) (5) and [(n-Bu2Sn)4(4,6-L2)O 2(OH)(OC2H5)]2·2(C 2H5OH) (6) (4,6-H2L2 = 4,6-bis(4-methylbenzoyl)isophthalic acid), have been synthesized. All the organotin carboxylates have been characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy and X-ray crystallography diffraction analyses. The structural analysis reveals that complexes 1-3 show similar structures, containing binuclear triorganotin skeletons. The significant intermolecular O-H?O hydrogen bonds linked the complexes 1-3 to form a novel 2D network polymer with 38-member macrocycles. In complexes 4-6, two Sn4O4 ladders are connected by two 1,3-benzenedicarboxylic acid derivatives to yield ladder-like octanuclear architectures and form macrocycle with 24 atoms. In addition, the antitumor activities of complexes 1-6 have been studied.

Substituted pentacene semiconductors

Substituted pentacene compounds comprise at least one substituent selected from the group consisting of electron-donating substituents, halogen substituents, and combinations thereof; the substituent(s) each being bonded to a carbon atom of a terminal ring of pentacene, and being the only substituent(s); with the proviso that when the compound has only two substituents, both of which are methyl or alkoxy, and one substituent is bonded to the number 2 carbon atom, the other substituent, if methyl, is bonded to the number 1, 3, 4, 8, or 11 carbon atom and, if alkoxy, is bonded to the number 1, 3, 4, 8, 9, or 11 carbon atom; and with the further proviso that when the compound has only four substituents, all of which are alkoxy, the substituents are bonded to the numbers 2, 3, 9, and 10 carbon atoms.