http://nopr.niscair.res.in/handle/123456789/8753 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8766 Title: Epoxidation studies of terpenes with urea hydrogen peroxide and phosphotungstic acid <br/> <br/>Authors: Kaur, Damandeep; Manktala, R; Chahal, K K; Chhabra, B R <br/> <br/>Abstract: Epoxidation of isolated and allylic olefins with dodeca-phosphotungstic acid, H₃[PW₁₂O₄0]xH₂O and urea hydrogen peroxide (UHP) adduct as an oxidant has successfully been carried out under homogenous conditions with the aid of isopropanol:water (4:1) as solvent, thereby avoiding the use of expensive phase transfer catalyst. The method has proven to be efficient in terms of percent yield, cost, reaction conditions and ease of work-up. <br/> <br/>Page(s): 598-602 http://nopr.niscair.res.in/handle/123456789/8765 Title: Efficient synthesis of some novel spiro heterocycles containing triazine nucleus and their microbiological activity <br/> <br/>Authors: Dabholkar, Vijay V; Tripathi, Dilip Ravi <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> The compound 4-[(2,4-substituted benzylidine)-amino]-3-thioxo-1,2,4-triazin-5-one <b style="">2</b> is treated with bromine in glacial acetic acid to yield, 4-[(2,4-substituted benzylidine)-amino]-6,6-dibromo-3-thioxo-1,2,4-triazin-5-one <b style="">3.</b> The dibromo compound <b style="">3</b> is then subjected to reaction with substituted triazoles and amino thiophenol to furnish, 1-thia-2,3-(3′-substituted)-triazolo-4,6,7,9-tetraza-4,6,7-trihydro-8-thioxo-10-oxo-9[(2"/4" substituted ben­zyli­dine)-amino]spiro[4.5]decane <b style="">4</b> and, 1-thia-2,3-(3'-substituted)-benzo-4,6,7,9-tetraza-4,6,7-trihydro-8-thioxo-10-oxo-9[(2"/4" substituted benzylidine)-amino]spiro[4.5]decane <b style="">5</b>, respectively. The compounds have been synthesized by conventional methods. The IR, ¹H NMR, ¹³C NMR and mass spectral fragmentation patterns of some prepared compounds have been investigated to elucidate the structure of the synthesized compounds. The final compounds have also been screened for microbiological activity, which show some inhibitory action against gram positive and gram negative micro organisms. </smarttagtype> <br/> <br/>Page(s): 593-597 http://nopr.niscair.res.in/handle/123456789/8764 Title: A facile four component one-pot synthesis of polyhydroquinoline derivatives catalyzed by ionic liquid via modified Hantzsch reaction <br/> <br/>Authors: Nirmal, Jay P; Dadhaniya, Pratish V; Patel, Manish P; Patel, Ranjan G <br/> <br/>Abstract: An efficient and newer<b> </b>Hantzsch reaction for the synthesis of polyhydroquinoline derivatives have been reported <i style="">via</i> four-component condensation of aldehydes, cyclic 1,3-diketones, <img src='/image/spc_char/beta.gif' border=0>-keto esters, NH₄OAc and catalytic amount of ionic liquid 1-Vinyl-3-Ethyl imidazolium  iodide [VEim]I. This methodology is operationally simple, economical,rapid and high yielding. <br/> <br/>Page(s): 587-592 http://nopr.niscair.res.in/handle/123456789/8763 Title: Acidic task specific ionic liquid catalyzed synthesis of dihydropyrimidinones <br/> <br/>Authors: Singh, Vasundhara; Kaur, Sukhbir; Ratti, Rajni; Kad, Goverdhan L; Singh, Jasvinder <br/> <br/>Abstract: An acidic ionic liquid [bmim]HSO₄ has been used as catalyst for simple, green and efficient synthesis of an array of 3,4-dihydropyrimidin-2-(1<i style="">H</i>)-ones using thermal and microwave irradiation. Products have been obtained in high state of purity and good yields using this one pot methodology. <br/> <br/>Page(s): 611-616