http://nopr.niscpr.res.in/handle/123456789/320 Fri, 09 Oct 2026 19:39:43 GMT 2026-10-09T19:39:43Z http://nopr.niscpr.res.in/handle/123456789/721 Title: Alkaloids of Sida cordifolia L. Authors: Sutradhar, Ranajit K; Matior Rahman, A K M; Ahmad, Mesbah U; Saha, Koushik Abstract: Four new alkaloids, viz; 1,2,3,9-tetrahydro-pyrrolo [2,1-b] quinazolin-3-ylamine, 5′-hydroxymethyl-1′-(1,2,3,9-tetrahydro-pyrrolo [2,1-b] quinazolin-1-yl)-heptan-1-one, 2-(1′-amino-butyl) indol-3-one and 2′-(3H-indol-3-ylmethyl)-butan-1′-ol have been isolated from methanol extract of the aerial parts of Sida cordifolia L and characterized using ¹H NMR, ¹³C NMR, COSY, HMBC and mass spectra. Page(s): 1896-1900 Thu, 01 Nov 2007 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/721 2007-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/720 Title: KHSO₄-SiO₂-MeOH An efficient selective solid-supported system for deprotection of alcohols from esters Authors: Goswami, Amrit; Das, Ram N; Borthakur, Naleen Abstract: KHSO₄-SiO₂ can efficiently deprotect alcohols from esters through transesterification in methanol under mild condition. Esters of aromatic alcohols are easily transesterified at room temperature compared to the corresponding aliphatic or alicyclic alcohol. N-Acetyl compounds and ethers are resistant to the reagent under the above condition. The method is very useful for preparation of bio-diesel methyl ricinoleate from castor oil. Page(s): 1893-1895 Thu, 01 Nov 2007 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/720 2007-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/719 Title: The electrosynthesis of pinacols Authors: Jiang Bian, Yan-; Sheng Bai, Dong- Abstract: Electrosynthesis of pinacols by iron as electrode in acid condi-tion is performed. The influence of electric potential and time on pinacol yield is explored. The optimal reaction conditions are at electric potential 4 V, time 60 min., methanol (6 mL), hydrochlo-ric acid (2 N, 2 mL), with the yield of pinacols up to 18-81%. The main advantages of the present procedure are milder reaction conditions and operational simplicity. Page(s): 1890-1892 Thu, 01 Nov 2007 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/719 2007-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/718 Title: Gallium(III) halides catalyzed, microwave enhanced, synthesis of 3,4-dihydropyrimidin-2-(1H)-ones under solvent free condition Authors: Saini, Anil; Kumar, Sanjay; Sandhu, Jagir S Abstract: Gallium(III) halides catalyzed and microwave enhanced three component Biginelli reaction of aldehyde, 1,3-dicarbonyl compounds and urea or thiourea under solvent free conditions to afford 3,4-dihydropyrimidin-2-(1H)-ones in excellent yields is described. The present procedure for the production of dihydropyrimidinones describes the first ever catalytic activity of gallium(III) halides. This improved procedure is fairly simple, facile and environment friendly. Page(s): 1886-1889 Thu, 01 Nov 2007 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/718 2007-11-01T00:00:00Z