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Sultānpur Lodhi, India

Singh D.,Dyal Singh College | Jaggi N.,National Institute of Technology Kurukshetra | Singh N.,Kurukshetra University
Indian Journal of Physics | Year: 2010

The organic compound 1,8-dibromooctane (1,8-DBO) exists in liquid phase at ambient temperatures and has versatile synthetic applications. In its liquid phase 1,8-DBO has been expected to exist in four most probable conformations, with all its carbon atoms in the same plane, having symmetries C 2h, C 1, C 2 and C 1 In the present study a detailed vibrational analysis in terms of assignment of Fourier transform infrared (FT-IR) and Raman bands of this molecule using normal co-ordinate calculations has been done. Asystematic set of symmetry co-ordinates has been constructed for this molecule and normal co-ordinate analysis Is carried out using the computer program MOLVIB. The force-field transferred from already studied lower chain bromo-alkanes is subjected to refinement so as to fit the observed infrared and Raman frequencies with those of calculated ones. The potential energy distribution (PED) has also been calculated for each mode of vibration of the molecule for the assumed conformations. ©2010 IACS.


Tejpal H.,Dyal Singh College | Chaudhary B.S.,Kurukshetra University
Transactions of the Institute of Indian Geographers | Year: 2014

Accelerated developmental activities during the past few decades have imposed immense pressure on rivers which functions as life support systems. As a result, many river channels in the world have been altered drastically to the level beyond their natural resilience capacity. Among various types of human interventions, indiscriminate extraction of sand and gravel is most disastrous one, as it threatens the very existence of the riverine ecosystem. The present study examines the impact of sand and stone extraction on land and groundwater resources in the Narnaul Block ofHaryana. For this purpose, areal expansion ofsand and stone quarries and their impacts on local ecology in the study area have been examined using geo-spatial techniques. Images captured by Landsat 1 MSS and Landsat 7 ETM+ satellites between 1975 and 2009 have been used for the analysis. Changes in the natural vegetation as a function of the production level in the quarries have been computed using the normalized difference vegetation index. It is revealed that the vegetated areas have decreased rapidly between 1975 and2009following an upsurge in sand and stone mining activity in the region. In addition, excessive extraction of construction material has accelerated the decline in the groundwater level, particularly in the Dohan river catchment part of the study area in recent years. The construction boom has fueled the demand whereas weak governance and rampant corruption have facilitated hysterical and illegal mining of construction material from the dry river channels threatening ecology.


Kumar R.,Dyal Singh College | Wadhwa D.,Kurukshetra University | Hussain K.,Kurukshetra University | Prakash O.,Kurukshetra University
Synthetic Communications | Year: 2013

A modified protocol for diastereoselective synthesis of differently substituted trans-2,3-dihydrofuro[3,2-c]coumarins is developed via, a one-pot multicomoponent reaction starting from aromatic aldehydes, 4-hydroxycoumarin, and α-tosyloxyacetophenones with pyridine and triethylamine as catalysts. The developed protocol provides a better alternative to the existing methods as it involves utilization of α-tosyloxyacetophenones that may be generated in situ from acetophenones and [hydroxyl(tosyloxy)iodo]benzene (HTIB, Koser's reagent), avoiding the use of α-haloacetophenones. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications® to view the free supplemental file. © 2013 Taylor and Francis Group, LLC.


Singh D.,Dyal Singh College | Jaggi N.,National Institute of Technology Kurukshetra | Singh N.,Kurukshetra University
Indian Journal of Physics | Year: 2010

The organic compound 1-chlorooctane exists in liquid state at ambient temperatures and has numerous synthetic applications. Fourier transform infrared and Raman spectra of this molecule have been recorded in the range of 4000-400 cm-1 and 3500-200 cm-1, respectively. A detailed vibrational analysis in terms of assignment of the observed frequencies of this molecule for its four most probable conformations in liquid phase, having symmetries Cs and Cl, has been done using normal co-ordinate calculations. The force-field transferred from already studied lower chain chloro-alkanes is subjected to refinement so as to fit the observed infrared and Raman frequencies with those of calculated ones. The potential energy distribution has also been calculated for each mode of vibration of the molecule for the most probable conformations present in its liquid phase. © 2010 IACS.


Prakash O.,Kurukshetra University | Aneja D.K.,Kurukshetra University | Hussain K.,G N Khalsa Pg College | Kumar R.,Dyal Singh College | And 3 more authors.
Journal of Heterocyclic Chemistry | Year: 2012

A series of new symmetrical 3,6-bis(aryl)bis([1,2,4]triazolo)[3,4-a:4',3'- c]phthalazines 9a-l has been conveniently synthesized by oxidative cyclization of 1,4-bis(substituted benzalhydrazino)phthalazines 8a-l promoted by iodobenzene diacetate under mild conditions (12 examples, up to 93% yield). All the 12 compounds were tested in vitro for their antibacterial activity against two Gram-positive bacteria, namely, Staphylococcus aureus, Bacillus subtilis and two Gram-negative bacteria, namely, Escherichia coli and Pseudomonas aeruginosa. All the synthesized compounds were also tested for their antifungal action against two fungi, Aspergillus niger and Aspergillus flavus. © 2012 HeteroCorporation.

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