Insight into the Hard−Soft Acid−Base Properties of Differently Substituted Phenylhydrazines in Reactions with Dimethyl Carbonate†

2008 ◽  
Vol 112 (46) ◽  
pp. 14525-14529 ◽  
Author(s):  
Anthony E. Rosamilia ◽  
Fabio Aricò ◽  
Pietro Tundo
Keyword(s):  
Dimethyl Carbonate ◽  
Acid Base ◽  
Soft Acid ◽  
Insight Into ◽  
Base Properties

Striking Influence of the Catalyst Support and Its Acid–Base Properties: New Insight into the Growth Mechanism of Carbon Nanotubes

ACS Nano ◽  
2011 ◽  
Vol 5 (5) ◽  
pp. 3428-3437 ◽  
Author(s):  
Arnaud Magrez ◽  
Rita Smajda ◽  
Jin Won Seo ◽  
Endre Horváth ◽  
Primož Rebernik Ribic̆ ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Catalyst Support ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

An insight into the Meerwein–Ponndorf–Verley reduction of α,β-unsaturated carbonyl compounds: Tuning the acid–base properties of modified zirconia catalysts

2009 ◽  
Vol 268 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Francisco J. Urbano ◽  
María A. Aramendía ◽  
Alberto Marinas ◽  
José M. Marinas
Keyword(s):  
Carbonyl Compounds ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

Direct synthesis of dimethyl carbonate from CO2 and methanol over CaO–CeO2 catalysts: the role of acid–base properties and surface oxygen vacancies

2017 ◽  
Vol 41 (20) ◽  
pp. 12231-12240 ◽  
Author(s):  
Bin Liu ◽  
Congming Li ◽  
Guoqiang Zhang ◽  
Lifei Yan ◽  
Zhong Li
Keyword(s):  
Oxygen Vacancies ◽  
Dimethyl Carbonate ◽  
Direct Synthesis ◽  
Surface Oxygen ◽  
Acid Base ◽  
Base Properties

The addition of CaO to the CeO2 catalyst had a significant impact on the acid–base properties and amounts of oxygen vacancies on the surface catalyst.

scholarly journals Direct synthesis of N-methylurethanes from primary amines with dimethyl carbonate

2005 ◽  
Vol 77 (10) ◽  
pp. 1719-1725 ◽  
Author(s):  
Pietro Tundo ◽  
Salima Bressanello ◽  
Alessandro Loris ◽  
Gabriel Sathicq
Keyword(s):  
Aromatic Amines ◽  
Dimethyl Carbonate ◽  
Direct Synthesis ◽  
High Yield ◽  
Primary Amines ◽  
Methyl Derivative ◽  
Acid Base ◽  
One Step ◽  
Soft Acid ◽  
Mechanism Of The Reaction

The mechanism of the reaction between amines with dimethyl carbonate (DMC) has been investigated. Whereas in the absence of bases, they give methylation and carboxymethylation reactions without selectivity (BAl2 and BAc2 mechanisms, respectively), in the presence of bases, the BAc2 mechanism prevails. The carbamate already formed reacts further with DMC via the BAl2 mechanism to give the corresponding N-methyl derivative. Such pronounced double selectivity has been explained in terms of Pearson's Hard-Soft Acid-Base (HSAB) theory.Accordingly, N-methylcarbamates have been prepared from primary aliphatic and aromatic amines, either at reflux temperature of DMC (90 °C) or at 230 °C in autoclave. The reaction can be carried out in one step or through the isolation of the carbamate and the subsequent methylation reaction with DMC. This method is the direct synthesis, in high yield and selectivity, of secondary N-methylamines from the corresponding primary amines.

Corrigendum to “An insight into the Meerwein–Ponndorf–Verley reduction of a,b-unsaturated carbonyl compounds: Tuning the acid–base properties of modified zirconia catalysts” [J. Catal. 268 (2009) 79–88]

2010 ◽  
Vol 271 (1) ◽  
pp. 153 ◽  
Author(s):  
Francisco J. Urbano ◽  
Rafael Romero ◽  
María A. Aramendía ◽  
Alberto Marinas ◽  
José M. Marinas
Keyword(s):  
Carbonyl Compounds ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

Acid-base properties of borates under kraft pulp cooking conditions

2003 ◽  
Vol 18 (1) ◽  
pp. 90-94
Author(s):  
Per Ulmgren ◽  
Disa Tormund
Keyword(s):  
Kraft Pulp ◽  
Acid Base ◽  
Cooking Conditions ◽  
Base Properties

Effects of Acid-Base Properties of Oxide Catalysts on Transformation of 1,2-Propylene Glycol

2010 ◽  
Vol 31 (4) ◽  
pp. 441-446
Author(s):  
Zhengxi YU ◽  
Lei XU ◽  
Xinzhi ZHANG ◽  
Zhongmin LIU
Keyword(s):  
Propylene Glycol ◽  
Oxide Catalysts ◽  
Acid Base ◽  
Base Properties
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