Indian Journal of Chemistry: Sec B- Organic Chemistry including Medicinal Chemistry

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Published by: NISCAIR (CSIR)

Subjects: Chemistry

Indian Journal of Chemistry (Section B) is published by the National Institute of Science Communication and Information Resources (NISCAIR)-CSIR, New Delhi. This journal publishes articles in Organic and Medicinal Chemistry. It includes full length papers, notes and communications and short reviews. The monthly issues covers articles in organic reaction mechanism, theoretical organic chemistry, structure-activity relationships, medicinal chemistry, synthesis of chiral compounds, bio-organic chemistry, enzymes in organic synthesis, reagents in organic synthesis, heterocyclic compounds, phytochemistry (natural products), amino acids, peptides and proteins, spectroscopy in characterization of organic compounds, chemoenzymatic and enantioselective synthesis of organic compounds, synthesis of fullerenes, metal-catalyzed asymmetric reactions, bioactive plant products and combinatorial chemistry.

Contact

Editor,
Dr. P Paravatharajan
email: prema@niscair.res.in


ISSN No. :    0376-4699
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Ab initio investigation of electrophilic addition of chlorine to norbornadiene
Title: Ab initio investigation of electrophilic addition of chlorine to norbornadiene

Authors: Abbasoglu, Rza

Abstract: Full geometry optimization of norbornadiene (NB) has been done by ab initio  HF/3-21G*, HF/3-21G**, HF/6-31 G*, HF/6-311G* and HF/6-311G* methods and the structure of the molecule is investigated. The double bonds of molecule are endo pyramidalized. The electron densities (qi, HOMO) on exo and endo faces of the double bonds are not equal and it is bigger on the exo face. The NB-Cl2 system is investigated by HF/3-21G* method and the stable configurations are determined. The stable configurations of the NB-Cl2 system correspond to NB ... Cl2 (exo) and NB.... Cl2 (endo) molecular complexes that are formed by the exo and endo orientation of Cl2 molecule to the double bond of NB, respectively. The exo-molecular complex has been found to be relatively more stable than the endo-complex. The cationic intermediates of the reaction have been studied by ab initio methods. The exo-chloronium cation is found to be more stable than endo- chloronium cation. The exo-facial selectivity should be observed in the addition reaction to NB of chlorine. The results obtained indicate that a multi center nonclassical chlorocarbonium cation formed by the rearrangement of exo-chloronium cation is the most stable one among the cationic intermediates. It is likely that the ionic addition reaction proceeds via the nonclassical chlorocarbonium ion and results in the formation of the rearranged products. The mechanism of the addition reaction is also discussed.

Page(s): 1708-1712

Anti-tubercular, antioxidant and in vitro anti-inflammatory activity of some newly synthesized chalcones
Title: Anti-tubercular, antioxidant and in vitro anti-inflammatory activity of some newly synthesized chalcones

Authors: Alam, Shadab; Panda, Rakesh; Kachroo, Monica

Abstract: A series of chalcones of 4-acetyl pyridines and substituted aryl aldehydes have been synthesized and evaluated for antitubercular, antioxidant and anti-inflammatory activity. The structures of the synthesized compounds have been confirmed by IR, 1H and 13C NMR spectroscopy and CHN analysis. The new compounds have been evaluated for antitubercular activity against Mycobacterium tuberculosis H37 Rv using MABA method. In vitro anti-inflammatory activity has been performed by using bovine serum albumin assay method with diclofenac as standard and antioxidant activity by DPPH method.

Page(s): 440-443

Acylation of diselenides and disulfides with N-acylbenzotriazoles promoted by SmI2
Title: Acylation of diselenides and disulfides with N-acylbenzotriazoles promoted by SmI2

Authors: Tu, Ya Wei; Zhou, Lie Jin; Lv, Xin; Wang, Xiao Xia

Abstract: The acylation of diselenides or disulfides with N-acylbenzo-triazoles mediated by SmI2 has been achieved successfully without the presence of HMPA, and the corresponding selenolesters or thioesters have been prepared in good yields.

Page(s): 435-439

A simple process for the preparation of pralidoxime chloride
Title: A simple process for the preparation of pralidoxime chloride

Authors: Unnisa, Lateef; Sumakanth, M; Rao, B Leelamaheswara; Divi, Murali Krishnaprasad; Rao, Mysore Aswathanarayana

Abstract: Pralidoxime chloride (2-PAM chloride) is an important drug included in National List of Essential Medicines-2003 for treating pesticide poisoning. However, the current methods for its preparation use hazardous methyl halides such as methyl chloride or methyl iodide. In the present work, reaction of pyridine-2-aldoxime with methyl methanesulfonate in acetonitrile gave 2-PAM mesylate in high yields (90%). Use of methyl tosylate in toluene resulted in 2-PAM tosylate (90% yield). Both 2-PAM mesylate and 2-PAM tosylate on treatment with dry hydrogen chloride in isopropanol, resulted in 2-PAM chloride in high yields (90%) and purity (>99%).

Page(s): 431-435

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