scholarly journals Distribution of Gallium Nanocrystals in Ga/MCM-41 Mesocomposites by Continuous-Flow Hyperpolarized129Xe NMR Spectroscopy

2005 ◽  
Vol 77 (10) ◽  
pp. 3379-3382 ◽  
Author(s):  
Weiping Zhang ◽  
Christopher I. Ratcliffe ◽  
Igor L. Moudrakovski ◽  
Chung-Yuan Mou ◽  
John A. Ripmeester
Keyword(s):  
Nmr Spectroscopy ◽  
Continuous Flow ◽  
Mcm 41

Microwave-Assisted Grafting to MCM-41 Silica and its Application as Catalyst in Flow Chemistry

2011 ◽  
Vol 64 (11) ◽  
pp. 1522 ◽  
Author(s):  
Manuela Oliverio ◽  
Antonio Procopio ◽  
Toma N. Glasnov ◽  
Walter Goessler ◽  
C. Oliver Kappe
Keyword(s):  
Continuous Flow ◽  
Rate Increase ◽  
Flow Chemistry ◽  
Conventional Heating ◽  
Kinetic Effect ◽  
Microwave Technology ◽  
Microwave Assisted ◽  
Technology Control ◽  
First Time ◽  
Mcm 41

Finding environmentally gentle methods to graft Lewis acid on the surface of mesoporous materials is a topic of current interest. Herein we describe the optimization of a preparation procedure of a mesoporous silica-supported ErIII catalyst using the microwave-assisted post-calcination functionalization of Mobil Composition of Matter-41 silica as the key step. The required time for functionalization was reduced from several hours to 10 min using sealed-vessel microwave technology. Control experiments using conventional heating at the same temperature demonstrated that the rate increase is owing to a simple thermal/kinetic effect as a result of the higher reaction temperature. The resulting ErIII catalyst was tested for the first time as a catalyst in the continuous flow deprotection of benzaldehyde dimethylacetal and a complete leaching study was performed.

scholarly journals Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15

2011 ◽  
Vol 7 ◽  
pp. 22-28 ◽  
Author(s):  
Hynek Balcar ◽  
Tushar Shinde ◽  
Naděžda Žilková ◽  
Zdeněk Bastl
Keyword(s):  
Nmr Spectroscopy ◽  
Molecular Sieves ◽  
Direct Interaction ◽  
Mesoporous Molecular Sieves ◽  
Support Surface ◽  
Wall Surface ◽  
Ring Closing Metathesis ◽  
Immobilized Catalysts ◽  
Metathesis Catalyst ◽  
Mcm 41

A commercially available Hoveyda–Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was found for ring-closing metathesis of 1,7-octadiene in cyclohexane – 0.04% of catalyst Ru content). Results of XPS, UV–vis and NMR spectroscopy showed that at least 76% of the Ru content was bound to the support surface non-covalently and could be removed from the catalyst by washing with THF.

scholarly journals Continuous-flow synthesis and application of polymer-supported BODIPY Photosensitisers for the generation of singlet oxygen; process optimised by in-line NMR spectroscopy

2020 ◽  
Vol 10 (1) ◽  
pp. 327-345 ◽  
Author(s):  
Christopher G. Thomson ◽  
Callum M. S. Jones ◽  
Georgina Rosair ◽  
David Ellis ◽  
Jose Marques-Hueso ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Singlet Oxygen ◽  
Continuous Flow ◽  
Flow Synthesis ◽  
Polymer Supported ◽  
Oxygen Process

Probing the mobility of ibuprofen confined in MCM-41 materials using MAS-PFG NMR and hyperpolarised-129Xe NMR spectroscopy

2013 ◽  
Vol 15 (43) ◽  
pp. 18805 ◽  
Author(s):  
Flavien Guenneau ◽  
Kuldeep Panesar ◽  
Andrei Nossov ◽  
Marie-Anne Springuel-Huet ◽  
Thierry Azaïs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
129Xe Nmr ◽  
Pfg Nmr ◽  
Mcm 41

Preparation of Grignard reagents from magnesium metal under continuous flow conditions and on-line monitoring by NMR spectroscopy

2016 ◽  
Vol 57 (1) ◽  
pp. 122-125 ◽  
Author(s):  
Michel Goldbach ◽  
Ernesto Danieli ◽  
Juan Perlo ◽  
Bernard Kaptein ◽  
Victor M. Litvinov ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Continuous Flow ◽  
Grignard Reagents ◽  
Flow Conditions ◽  
Magnesium Metal ◽  
On Line

scholarly journals Continuous Flow 1H and 13C NMR Spectroscopy in Microfluidic Stripline NMR Chips

2017 ◽  
Vol 89 (4) ◽  
pp. 2296-2303 ◽  
Author(s):  
Anna Jo Oosthoek-de Vries ◽  
Jacob Bart ◽  
Roald M. Tiggelaar ◽  
Johannes W. G. Janssen ◽  
P. Jan M. van Bentum ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Continuous Flow ◽  
13C Nmr Spectroscopy ◽  
1H And 13C Nmr

Probing the Alkyl Ligands on Silylated Mesoporous MCM-41 Using Hyperpolarized129Xe NMR Spectroscopy

2005 ◽  
Vol 109 (2) ◽  
pp. 681-684 ◽  
Author(s):  
Shing-Jong Huang ◽  
Chin-Hui Huang ◽  
Wen-Hua Chen ◽  
Xianping Sun ◽  
Xizhi Zeng ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Mcm 41

Direct observation of DME carbonylation in the different channels of H-MOR zeolite by continuous-flow solid-state NMR spectroscopy

2015 ◽  
Vol 51 (94) ◽  
pp. 16868-16870 ◽  
Author(s):  
Ting He ◽  
Pengju Ren ◽  
Xianchun Liu ◽  
Shutao Xu ◽  
Xiuwen Han ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Direct Observation ◽  
Solid State Nmr ◽  
Continuous Flow ◽  
Mas Nmr ◽  
Solid State Nmr Spectroscopy

Surface acetyl intermediates on HMOR zeolites (CH3CO-Z) were detected during DME carbonylation using in situ continuous-flow 13C MAS NMR spectroscopy.

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