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Articles by Habib-ur- Rehman
Total Records ( 2 ) for Habib-ur- Rehman
  Syeda Farina Asghar , Habib-ur- Rehman , Atta-ur- Rahman and M. Iqbal Choudhary
  Phytochemical investigations on the methanol extract of Iris germanica resulted in the isolation of a new benzene derivative, 2´-methyl-6´-hydroxy cyclohexenyl-3-methyl-1-acetophenone ether (1). Further, another known benzene derivative, isopenol (2), also afforded two known isoflavones, irisolone (3) and irisolidone (4). The structure of the new compound was determined on the basis of spectroscopic data, including 2D-NMR experiments, while the known compounds were identified on the basis of their spectral data and existing literature evidence. The comparison of the spectral data of the irisolidone (3) with that reported for the molecule led us to revise some of the reported 1H-NMR chemical shift assignments.
  Syeda Farina Asghar , Khawaja Ansar Yasin , Habib-ur- Rehman and Shahid Aziz
  Semicarbazides, besides possessing medicinal properties, also find wide applications in agriculture and industry. We report in this article the synthesis of the four 1,4-disubstituted semicarbazides: 1-cinnamoyl-4-phenyl semicarbazide (1), 1-oleyl-4-phenyl semicarbazides (2), 1,1`,1"-tricitryl-4,4`,4"-triphenyl semicarbazide (3) and 1-benzoyl-4-phenyl semicarbazide (4), by the condensation of four different hydrazides: cinnamic acid hydrazide (5), oleic acid hydrazide (6), citric acid hydrazide (7) and benzoic acid hydrazide (8). The acid hydrazides were prepared by the condensation of four different acids with phenyl isocyanate. The semicarbazides were also subjected to acid catalysed intramolecular cyclisation. The cyclisation of (1) and (2) afforded substituted 1,3,4-oxadizoles: 2-cinnamoyl-5-aminophenyl 1,3,4-oxadizoles (9) and 2-oleyl-5-aminophenl 1,3,4-oxadizoles (10), respectively, in high yield, while no cyclisation occurred in the cases of (3) and (4). The products in each case have been identified on the basis of melting points and IR spectral studies.
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