1,3-Dipolar Cycloaddition ofN-Substituted Dipolarophiles and Nitrones:  Highly Efficient Solvent-Free Reaction

2008 ◽  
Vol 73 (7) ◽  
pp. 2621-2632 ◽  
Author(s):  
Thanh Binh Nguyen ◽  
Arnaud Martel ◽  
Robert Dhal ◽  
Gilles Dujardin
Keyword(s):  
Solvent Free ◽  
Dipolar Cycloaddition ◽  
Highly Efficient ◽  
Solvent Free Reaction

Solvent-free and selective tosylation of alcohols and phenols with p-toluenesulfonyl chloride by heteropolyacids as highly efficient catalysts

2006 ◽  
Vol 84 (5) ◽  
pp. 812-818 ◽  
Author(s):  
Razieh Fazaeli ◽  
Shahram Tangestaninejad ◽  
Hamid Aliyan
Keyword(s):  
Aliphatic Alcohols ◽  
Solvent Free ◽  
New Method ◽  
Heteropoly Acids ◽  
Hydroxyl Groups ◽  
Secondary Alcohols ◽  
Highly Efficient ◽  
Keggin Type ◽  
Primary Hydroxyl ◽  
Solvent Free Reaction

Tosylation of some alcohols and phenols has been directly carried out with p-toluenesulfonyl chloride using heterodoxy acids (H3PW12O40, H3PMo12O40, AlPW12O40, and AlPMo12O40) as catalysts in the absence of solvent. We found that heteropoly acids AlPW12O40 and AlPMo12O40 were effective catalysts for the tosylation of alcohols and phenols. In the case of aliphatic alcohols, secondary alcohols undergo tosylation chemoselectively in the presence of primary hydroxyl groups. This new method consistently has the advantage of excellent yields and short reaction time.Key words: tosylation, p-TsCl, Keggin-type polyoxometalate, solvent-free reaction.

A metal–organic framework as a highly efficient and reusable catalyst for the solvent-free 1,3-dipolar cycloaddition of organic azides to alkynes

2015 ◽  
Vol 2 (1) ◽  
pp. 42-46 ◽  
Author(s):  
Peng Li ◽  
Sridhar Regati ◽  
Huicai Huang ◽  
Hadi D. Arman ◽  
John C.-G. Zhao ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Solvent Free ◽  
Regioselective Synthesis ◽  
Dipolar Cycloaddition ◽  
Reusable Catalyst ◽  
Terminal Alkynes ◽  
Organic Azides ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
Metal Organic

A new highly efficient and reusable Cu-MOF has been developed for the regioselective synthesis of 1,2,3-triazoles via the 1,3-dipolar cycloaddition of organic azides to terminal alkynes under solvent-free conditions.

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