The condensation of rapanone1 (I) with various aldehydes and nitroso compounds yields the corresponding methylene-bis(2.5-dihydroxy-4-tridecyl-3,6-benzoquinones) (II) or their anhydro derivatives (III). The N-bis(anhydro-5-hydroxy-4-tridecyl-3,6-benzoquinones) (IV) have been synthesized and their properties recorded.
Spiro-Azoles Thiazolidinone in the Synthesis of Polymethine Cyanine Dyes
作者:Reda Mahmoud Abd El-Aal
DOI:10.1080/10426500307791
日期:2003.4
spiro azoles (pyrazolone, oxazolone, and/or imidazolone) inconjucton with heterocyclicthiazolidinonederivatives were prepared as starting materials in the synthesis of polymethine cyanine dyes. Reaction of spiro 2-formyl (oxime) azoles thiazolidinonederivatives with equi- and/or molar ratios of 2(4)-methyl substitutedheterocyclic quaternary salts afforded the corresponding compound pentamethine, aza-mero
Flash vacuum pyrolysis of azo and nitrosophenols: new routes towards hydroxyarylnitrenes and their reactions
作者:Yehia A Ibrahim、Nouria A Al-Awadi、Kamini Kual
DOI:10.1016/s0040-4020(03)00863-9
日期:2003.7
Flashvacuumpyrolysis of phenylazonaphthols and nitrosonaphthols at 700°C and 0.02 Torr yielded quinoline, isoquinoline, indene and naphthols (and aniline only from the phenylazo derivatives). Similar FVP of p-nitroso and p-phenylazophenol gave pyridine. Also, FVP of phenanthraquinonemonophenylhydrazone and monooxime gave phenathridine and fluorenone. The formation of the heterocyclic system was assumed
Synthesis of Some New Fu Sed/Spiro of Benzoindole Derivatives and Their Biological Activity
作者:H. A. Soleiman、A. K. Khalafallah、H. M. Abdelzaher
DOI:10.1002/jccs.200000175
日期:2000.12
pyrimidinthiones, thiazolidinones and β-lactams incorporating benzoindolederivatives have been synthesised by cyclocondensation addition reaction and cycloaddition reaction of hydrazine hydrate, hydroxylamine, thiourea, mercapto acetic acid and monochloroacetyl chloride. The pre pared com pounds were tested for anti bacterial and fungicidal activity. Gram-negative bacteria (Bacilluscereus), as well as the
wird gezeigt, dass primäre aromatische Amine ohne stark negative Substituenten (Halogenatome, Nitrogruppen, u. dgl.) entgegen der bisherigen Annahme durch Nitrosylschwefelsäure in konzentriert schwefelsaurer Lösung im allgemeinen nicht diazotiert werden, sondern in anderer Weise reagieren. Diejenigen, die mit Diazoverbindungen direkt zu p-Aminoazofarbstoffen kuppeln, werden dabei meist in p-Nitroso-amine