02512nas a2200229   4500008004100000022001400041245015100055210006900206260007300275300001400348490000600362520159700368653002101965653003301986653002402019653001102043100002102054700002102075700002602096700002902122856013102151       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<p>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.</p>10acyclic carbonate10aethylene glycol phenyl ether10ahydroxyalkoxylation10aphenol1 aKinage, Anil, K.1 aGupte, Sunil, P.1 aChaturvedi, Rajiv, K.1 aChaudhari, Raghunath, V.  uhttps://library.ncl.res.in/content/highly-selective-synthesis-mono-ethylene-glycol-phenyl-ethers-hydroxyalkoxylation-phenols-001780nas a2200229   4500008004100000022001400041245011700055210006900172260007900241300001400320490000700334520086600341653002701207653003801234653003101272653003101303100002101334700002201355700002001377700002601397856012701423       2011                        eng d  a1044-580300aGrowth of hydrothermally stable meso-porous silica structure interconnected around micro-porous zeolite crystals0 aGrowth of hydrothermally stable mesoporous silica structure inte  a360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USAbELSEVIER SCIENCE INCcDEC  a1166-11720 v623 a<p>The growth of hydrothermally stable ordered meso-porous silica with M41S type structure interconnected around zeolite crystals was achieved from seeds normally nucleating the crystallization of micro-porous zeolite. The solid state NMR and FT-IR showed species like Si(OSi)(3)OH and Si(OSi)(2)(OH)(2) (or Q(3) and Q(2) sites, respectively) are formed during first hydrothermal treatment with surfactant and NaOH. These species and surface silanol group of zeolite crystal condense to give meso-porous silica structure interconnected around zeolite crystal during re-crystallization at lower pH. Resulting meso-micro-porous hybrid material is found to be highly active, selective and stable in the synthesis of 2-(phenylamino) ethanol from aniline and ethylene carbonate compare to parent ZSM-5 and pure MCM-41. (C) 2011 Elsevier Inc. All rights reserved.</p>10aHydrothermal stability10aInterconnected meso-porous silica10aMeso-micro hybrid material10aSynthesis of amino alcohol1 aKinage, Anil, K.1 aPrashar, Atul, K.1 aBerlier, Gloria1 aChaturvedi, Rajiv, K.  uhttps://library.ncl.res.in/content/growth-hydrothermally-stable-meso-porous-silica-structure-interconnected-around-micro-0