31663-79-3Relevant academic research and scientific papers
Self-assembly of zincporphyrin dimer and pyromellitimide using two coordination bonds and photoinduced intramolecular electron transfer
Yamada, Koji,Imahori, Hiroshi,Yoshizawa, Eiichi,Gosztola, David,Wasielewski, Michael R.,Sakata, Yoshiteru
, p. 235 - 236 (1999)
Zincporphyrin dimer-pyromellitimide supramolecule has been designed and assembled using two coordination bonds. Photoinduced charge separation and charge recombination in the supramolecule were observed by picosecond time-resolved transient absorption measurements.
Tri(pentaflurophenyl)borane-catalyzed reduction of cyclic imides with hydrosilanes: Synthesis of pyrrolidines
Ding, Guangni,Wu, Xiaoyu,Lu, Bin,Lu, Wenkui,Zhang, Zhaoguo,Xie, Xiaomin
supporting information, p. 1144 - 1150 (2018/02/17)
B(C6F5)3-catalyzed hydrosilylation of cyclic imides afforded an efficient synthetic method of pyrrolidines. In the presence of 5 mol% B(C6F5)3, various aromatic, aliphatic and polycyclic imides were smoothly reduced by PhSiH3 to generate the corresponding pyrrolidines in high yields. The reaction profiles monitored by 1H NMR spectroscopy disclosed the reduction process of cyclic imides and the effect of difference structure of the hydrosilanes on the hydrosilylation.
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.
New isoindoline aminoxyl based polyradicals for spin probes and molecular magnetic materials
Smith, Craig D.,Bott, Raymond C.,Bottle, Steven E.,Micallef, Aaron S.,Smith, Graham
, p. 533 - 537 (2007/10/03)
The synthesis of a range of aminoxyl polyradicals based on the isoindoline aminoxyl moiety is described. FriedelCrafts alkylation reactions between 1,1,3,3-tetramethylisoindolin-2-yloxyl (1) and suitable haloalkanes were used to prepare three new biradicals and one new triradical. Standard methods 11 for the synthesis of nitronyl aminoxyls and iminyl aminoxyls were employed to prepare two novel tridentate biradical derivatives of 1. Also a novel isoindolinelike fused biradical was prepared. The room temperature solution EPR spectra of all radicals are reported and reveal a wide range of exchange coupling constants. The crystal structure determinations of two of these compounds, 1,1-bis(1',1',3',3'-tetramethylisoindolin-2'-yloxyl-5'-yl)ethane (3) and 1,2,3,5,6,-hexahydro-1,1,3,3,5,5,7,7octamethylbenzo[1,2-c:4,5-c']dipyrrol-2,6-di yloxyl (15), are reported.
