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  • catalyst
  • One class of potential Lewis acids that has received negligible attention as a catalyst is the carbocation. (diva-portal.org)
  • The idea is simple: By employing suitable cocatalysts in addition to a p acid, one may achieve reactivity not currently possible by use of the p-acid catalyst alone. (docme.ru)
  • Zr-SBA-15 Lewis acid catalyst has demonstrated an outstanding catalytic activity in the reduction of several carbonyl compounds by means of Meerwein Ponndorf Verley (MPV) reaction, using several secondary alcohols, and showing a very high selectivity towards the desired products. (mdpi.com)
  • The present paper introduces a simple and efficient method for the synthesis of substituted benzimidazoles by heterocyclization of different o -phenylenediamines and substituted aromatic carboxylic acid/aldehyde in the presence of zirconyl nitrate as catalyst in ethanol under reflux, which produced excellent yield of corresponding benzimidazoles in a short reaction time with reusability of catalyst. (hindawi.com)
  • In this context, in the present study, we report here the use of zirconyl nitrate as eco-friendly water-soluble Lewis acid catalyst for the synthesis of substituted benzimidazole. (hindawi.com)
  • In the continuation of our interest in synthesis of nitrogen-containing heterocyclic compounds [ 32 ], herein we founded the application of ZrO(NO 3 ) 2 as a Lewis acid catalyst for the synthesis of substituted benzimidazoles viathe condensation reaction between o- phenylenediamine and aldehyde, carboxylic acid derivatives (Scheme 1 ). (hindawi.com)
  • The complexes utilizing redox-active ligands became Lewis acidic upon oxidation, similar in behavior to the Noyori type catalyst that became Lewis acidic upon protonation. (illinois.edu)
  • The in situ IR studies revealed that the dehydration of glycerol occurs on weak Lewis acid sites and dehydrogenation takes place on strong basic sites on the catalyst surface. (rsc.org)
  • Carbon
  • This compound forms an active frustrated Lewis pair with P t Bu 3 that heterolytically splits dihydrogen and adds carbon dioxide as a geminal chelate bis-boryl component. (rsc.org)
  • palladium
  • Finally, the O -( α -bromoacyl) cyanohydrins were subjected to a palladium catalyzed cross-coupling with a range of boronic acids. (diva-portal.org)
  • types of Lewis base
  • This geometry enables the proton to penetrate all types of Lewis base HOMO topology. (meta-synthesis.com)
  • The previous page showed that there are six quite distinct types of Lewis acid and four quite distinct types types of Lewis base, where distinction is by frontier molecular orbital (FMO) topology. (meta-synthesis.com)
  • It follows that the the six types of Lewis acid and the four types of Lewis base inevitably interact to give 24 distinct types of Lewis acid/base complex . (meta-synthesis.com)
  • The previous page introduced the notion that there are four distinct types of Lewis base , where classification is based on the frontier molecular orbital FMO topology. (meta-synthesis.com)
  • The six distinct types of Lewis acid and the four distinct types of Lewis base where distinction is by frontier molecular orbital (FMO) topology, ie the shape, phase and geometry of the participating HOMOs and LUMOs interact to give 24 distinct types of Lewis acid/base complex. (meta-synthesis.com)
  • interactions
  • Solvent dependent 15 N and 11 B NMR spectroscopic properties and solid-state 11 B NMR measurements provide support for intermolecular interactions involving Lewis acid and base sites. (rsc.org)
  • organic
  • Although various kinds of Lewis acids have been developed, most of them are used only under strictly anhydrous conditions, in excess, and with hazardous organic solvents which are not environment friendly. (hindawi.com)
  • conditions
  • of Lewis acids under various conditions. (epfl.ch)
  • 1) represents a reactive frustrated Lewis pair that is able to heterolytically split dihydrogen 9 under mild conditions (r.t., 2.0 bar of H 2 , overnight in pentane). (rsc.org)
  • various
  • Herein we describe our efforts on the Lewis acid catalyzed stereoselective ring-opening of pentafulvene derived diazabicyclic olefins using various ortho -functionalized aryl iodides such as 2-iodoanilines, 2-iodophenols and 2-iodobenzene thiols to access trans -1,2 disubstituted alkylidenecyclopentenes. (rsc.org)