全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:Geetha Gopalakrishnan , Viswanathan Kasinath ...
来源:[J].Molecules(IF 2.428), 2000, Vol.5 (6), pp.880DOAJ
摘要:A tandem demethylation-cyclisation reaction resulting in the formation of pyran rings using AlCl3/EtSH reagent under mild reaction conditions is reported. X-ray diffraction studies on the intermediate support the suggested mechanism.
作者:Geetha Gopalakrishnan , N. D. Pradeep Singh , V. Kasinath
来源:[J].Molecules(IF 2.428), 2001, Vol.6 (6), pp.551DOAJ
摘要:Photolysis of Salannin (1), an important bioactive compound from Azadirachta indica A.Juss (Neem), affords Δ17-isosalanninolide (2), a hitherto unknown compound, along with isosalanninolide (3) and salanninolide (4). A probable mechanism has been suggested. While the...
作者:Geetha Gopalakrishnan , N. D. Pradeep Singh , V. Kasinath
来源:[J].Molecules(IF 2.428), 2002, Vol.7 (2), pp.112DOAJ
摘要:Nimonol (1), a tetranortriterpenoid isolated from the leaves of Azadirachta indica A. Juss (Meliaceae), upon photolysis undergoes both Diels-Alder and ene reactions with singlet oxygen at different sites leading to 14,15,20,21-diepoxy-23-nimonolactone (3), along with nimonol...
作者:Geetha Gopalakrishnan , Viswanathan Kasinath ...
来源:[J].Molecules(IF 2.428), 2002, Vol.7 (5), pp.412DOAJ
摘要:A facile regio- and chemoselective bromomethoxylation of alkenes under microwave irradiation conditions employing a new polymer supported brominechloride resin is reported. The resin is prepared from the commercially available chloride resin by a simple one step procedure.
作者:V. Kasinath , N. D. Pradeep Singh , Geetha Gopalakrishnan
来源:[J].Molecules(IF 2.428), 2002, Vol.7 (2), pp.112-118DOAJ
摘要:Nimonol (1), a tetranortriterpenoid isolated from the leaves of Azadirachta indica A. Juss (Meliaceae), upon photolysis undergoes both Diels-Alder and ene reactions with singlet oxygen at different sites leading to 14,15,20,21-diepoxy-23-nimonolactone (3), along with nimonol...
作者:... N. D. Pradeep Singh , Viswanathan Kasinath , Geetha Gopalakrishnan
来源:[J].Molecules(IF 2.428), 2000, Vol.5 (6), pp.880-885DOAJ
摘要:A tandem demethylation-cyclisation reaction resulting in the formation of pyran rings using AlCl3/EtSH reagent under mild reaction conditions is reported. X-ray diffraction studies on the intermediate support the suggested mechanism.
作者:V. Kasinath , N. D. Pradeep Singh , Geetha Gopalakrishnan
来源:[J].Molecules(IF 2.428), 2001, Vol.6 (6), pp.551-556DOAJ
摘要:Photolysis of Salannin (1), an important bioactive compound from Azadirachta indica A.Juss (Neem), affords Δ17-isosalanninolide (2), a hitherto unknown compound, along with isosalanninolide (3) and salanninolide (4). A probable mechanism has been suggested. While the...
作者:... N. D. Pradeep Singh , Viswanathan Kasinath , Geetha Gopalakrishnan
来源:[J].Molecules(IF 2.428), 2002, Vol.7 (5), pp.412-419DOAJ
摘要:A facile regio- and chemoselective bromomethoxylation of alkenes under microwave irradiation conditions employing a new polymer supported brominechloride resin is reported. The resin is prepared from the commercially available chloride resin by a simple one step procedure.
作者:... M. Sivarama Krishnan , Geetha Gopalakrishnan , G. Suresh
来源:[J].Acta Crystallographica Section E(IF 0.347), 2006, Vol.62 (12), pp.o5694-o5696Wiley
摘要:The title compound [systematic name: (5α,7α,13α,17α)‐7‐(acet­yloxy)‐21,23‐ep­oxy‐4,4,8‐trimethyl‐24‐norchola‐1,14,20,22‐tetraen‐3‐one], C28H36O4, was isolated from uncrushed green leaves of Azadirachta indica A. ...
作者:... G. Suresh , P. D. Partho , Geetha Gopalakrishnan
来源:[J].Journal of Chemical Ecology(IF 2.462), 1996, Vol.22 (8), pp.1453-1461Springer
摘要:Abstract(#br)The antifeedant and insect growth-regulating activities of salannin, nimbin, and 6-deacetylnimbin, in comparison with azadirachtin-A, have been studied against Spodoptera litura, Pericallia ricini , and Oxya fuscovittata . Salannin deterred feeding, delayed molt by i...

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