01243nas a2200265 4500008004100000022001400041245007100055210006700126260008600193300001200279490000700291520036600298653000600664653001600670653002000686653001400706653001800720100002500738700002100763700002500784700002000809700002100829700002900850856009800879 2008 eng d a0039-791100aHighly efficient sulfimidation of 1,3-dithianes by Cu(I) complexes0 aHighly efficient sulfimidation of 13dithianes by CuI complexes a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcFEB a619-6250 v383 a

A series of four Cu(I) complexes were tested for sulfimidation of 1,3-dithianes in the presence of [N-(p-tolysulfonyl)imino]phenyliodinane (PhI = NTs) as the nitrene-transfer agent. Cu(TMPhen)(PPh3)Br is an efficient catalyst with more than 90% yield of the corresponding product with less reaction time as compared to the literature copper(I) complexes.

10a110a3-dithianes10aCu(I) complexes10aPhI = NTs10asulfimidation1 aGiribabu, Lingamallu1 aSingh, Surya, P.1 aPatil, Nandkumar, M.1 aKantam, Lakshmi1 aGupte, Sunil, P.1 aChaudhari, Raghunath, V. uhttp://library.ncl.res.in/content/highly-efficient-sulfimidation-13-dithianes-cui-complexes-002511nas a2200229 4500008004100000022001400041245015100055210006900206260007300275300001400348490000600362520159700368653002101965653003301986653002402019653001102043100002102054700002102075700002602096700002902122856013002151 2008 eng d a1566-736700aHighly selective synthesis of mono-ethylene glycol phenyl ethers via hydroxyalkoxylation of phenols by cyclic carbonates using large pore zeolites0 aHighly selective synthesis of monoethylene glycol phenyl ethers  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a1649-16550 v93 a

Hydroxyalkoxylation of phenols by cyclic carbonates catalyzed by alkali loaded large pore zeolites has been reported. The study shows that KL type zeolite was recyclable and selective in producing mono-ethylene glycol pheryl ethers in similar to 98.5% yield. Various substituted simple phenols were converted into mono-ethylene glycol ether of phenols with over 90% yields, except 3-bromo and 2-methyl phenols. Mono hydroxyl plienols such as hydroquinone, biphenol and BPA (2,2-bis(4-hydroxyphenyl)propane) also produce corresponding mono- and di-ethylene glycol ethers. The ratio of ethylene carbonate to phenol was found to be critical for selective formation of monoethylene glycol phenyl ether of phenols. A ratio of two results in formation of appreciable amount of diether derivative viz., 2-(2-phenoxyethoxy) ethanol. Compared to ethylene carbonate, a lower reactivity of 1,2-propane carbonate was found for hydroxyalkoxylation of phenol. It was found that ring opening at less hindered methylene carbon of 1,2-propylene carbonate prevailed giving rise to selective formation of beta-hydroxy phenyl ethers. The reactivity of ethylene carbonate towards O-alkylation versus transesterification of phenol has been explained on the basis of HSAB concept. Finally, it has been shown that yield of mono-ethylene glycol phenyl ether is controlled both by basicity and channel architecture of zeolite structure. KL zeolite was found to be the most effective zeolite because of it's intermediate basicity and one dimensional channel architect. (C) 2008 Elsevier B.V. All rights reserved.

10acyclic carbonate10aethylene glycol phenyl ether10ahydroxyalkoxylation10aphenol1 aKinage, Anil, K.1 aGupte, Sunil, P.1 aChaturvedi, Rajiv, K.1 aChaudhari, Raghunath, V. uhttp://library.ncl.res.in/content/highly-selective-synthesis-mono-ethylene-glycol-phenyl-ethers-hydroxyalkoxylation-phenols-002271nas a2200229 4500008004100000022001400041245012300055210006900178260007300247300001000320490000800330520141000338653001401748653001701762653001101779653002801790653002501818100002501843700002101868700002901889856012301918 2010 eng d a0926-860X00aHeterogenized copper catalysts for the amination of arylhalide: synthesis, characterization and catalytic applications0 aHeterogenized copper catalysts for the amination of arylhalide s aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a73-810 v3723 a

This research investigated the synthesis, characterization and catalytic activity of heterogenized copper complexes for the selective amination of aryl halides. Amination reactions using homogeneous copper catalyst systems are not generally selective and it is also difficult to recover the catalyst from the homogeneous system for recycling. To overcome these difficulties, our efforts were directed towards the development of cheaper heterogeneous catalyst systems, which can be easily recovered and recycled. Heterogenized analogs of the homogenous Cu complexes were prepared using two methods: (a) encapsulation of copper complexes in zeolite-Y and (b) tethering of copper complexes on various supports like zeolite-Y, silica, charcoal, or clay. The encapsulated and tethered copper catalysts on zeolite-Y were characterized using EPR, Diffused reflectance UV-vis, XRD, IAS, ICPES, SEM, and TEM. The results confirmed that the copper complexes were truly heterogenized in zeolite-Y support. Encapsulated and tethered copper complexes were tested for amination of aryl iodide. The effects of various reaction parameters were examined using tethered Cu(Phen)(PPh(3))Br-PTA-Y catalyst to determine optimum conditions. A recycle study of encapsulated and tethered Cu catalyst was carried out to test their robustness for possible commercial exploitation. (C) 2009 Elsevier B.V. All rights reserved.

10aAmination10aC-N coupling10aCopper10aheterogeneous catalysis10amesoporous materials1 aPatil, Nandkumar, M.1 aGupte, Sunil, P.1 aChaudhari, Raghunath, V. uhttp://library.ncl.res.in/content/heterogenized-copper-catalysts-amination-arylhalide-synthesis-characterization-and-0