52497-39-9Relevant articles and documents
Synthesis of some new heterocyclic nitrogen compounds starting from pyromellitic dianhydride
Abo-Bakr, Ahmed M.,Hassan, Mamdouh A.,Temirek, Husien. H.,Mosallam, Ahmed M.
, p. 1567 - 1578 (2013/06/27)
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.
Macrocyclic organotin(IV) carboxylates based on benzenedicarboxylic acid derivatives: Syntheses, crystal structures and antitumor activities
Du, Dafeng,Jiang, Zijiang,Liu, Chunling,Sakho, Adama Moussa,Zhu, Dongsheng,Xu, Lin
experimental part, p. 2549 - 2558 (2011/07/09)
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.
