http://nopr.niscair.res.in/handle/123456789/311 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/452 Title: Two new eudesmanolides from Sphaeranthus indicus (Linn) <br/> <br/>Authors: Jadhav, Ravindra B; Sonawane, Kiran B; Deshpande, Nirmala R; Rojatkar, Supada R <br/> <br/>Abstract: Two new eudesmanolides have been isolated from the aerial part of Sphaeranthus indicus and their structures have been established as 11α,13-dihydro-3α,7α-dihydroxyeudesm-4-en 6α, 12-olide 1, 4-en-6β,7α-eudesmanolide 3, on the basis of spectral data and comparison of spectral data with those of reported data of compounds 2, 4 and 5. <br/> <br/>Page(s): 379-381 Mon, 29 Jan 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/451 Title: A Novel synthesis of nitrofuran containing 1,3,4,5-tetra substituted pyrazoles via 1,3-dipolar addition reaction <br/> <br/>Authors: Satheesha Rai N, Balakrishna Kalluraya <br/> <br/>Abstract: A hitherto unreported novel series of nitrofuran containing 1,3,4,5-tetra substituted pyrazole derivatives are prepared by the 1,3-dipolar cycloaddition reaction between 1-aryl-3-(5-nitro-2-furyl)propynones 1 with 4-substituted-3-aryl sydnones 2. The structures of these compounds are established by elemental analysis, IR, ¹H NMR and mass Spectral data. The new compounds are also screened for their antibacterial and antifungal activity and most of them showed significant activity. <br/> <br/>Page(s): 375-378 Mon, 29 Jan 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/450 Title: Stereoselectivity of the Wittig reaction in two-phase system <br/> <br/>Authors: Busafi, Saleh Al; Rawahi, Waffa Al <br/> <br/>Abstract: The Wittig reaction of benzyltriphenylphosphonium chloride with aliphatic and aromatic aldehydes has been investigated, respectively, in two-phase solvent system (dichloromethane / water) in the presence of sodium hydroxide. Both, the effect of the size of aliphatic aldehydes and the effect of substitution on benzaldehyde to the cis/trans ratios have been studied. It has been found that the use of aliphatic aldehydes in Wittig reaction gives higher ratio of trans alkene isomer. However, when aromatic aldehyde is used, the ratio of the cis alkene isomer is found to be higher than that of the trans isomer. In addition, the electronic nature of substituents (electron-donating group versus electron-withdrawing group) causes some changes in the cis/trans ratio of the product stilbene. <br/> <br/>Page(s): 370-374 Mon, 29 Jan 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/449 Title: A new prenylated isoflavone from Tephrosia tinctoria <br/> <br/>Authors: Reddy, B Anil Kumar; Khalivulla, S Ibrahim; Gunasekar, D <br/> <br/>Abstract: A new prenylated isoflavone, 7-O-geranylbiochanin A 1 has been isolated from the roots of Tephrosia tinctoria, together with three previously known compounds, 7-O-methylglabranin 2, flemichapparin B 3 and dehydrodeguelin 4. The structures of the compounds, 1 - 4 have been established by spectroscopic methods, including analysis by 2D NMR spectroscopy. <br/> <br/>Page(s): 366-369 Mon, 29 Jan 2007 22:58:59 GMT