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Ionic liquid mediated recyclable sulphonimide based organocatalysis for aldol reaction

100%
Srivastava V.
Open Chemistry
|
2010
|
vol. 8
|
issue 2
269-272
EN
Sulphonimide based organocatalyst was used to catalyze the aldol reaction in ionic liquid media. On the basis of yield and selectivity the ionic liquid mediated system was found superior in comparison with organic solvents. The added advantages of this ionic liquid mediated organocatalysis are easy recovery of product and the recyclability of the organocatalyst. [...]
2
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Comparison of Supported and Unsupported Proline Derivatives in Asymmetric Aminocatalytic Transformations

100%
Srivastava V.
Asymmetric Catalysis
|
2013
|
vol. 1
|
issue 1
EN
Organocatalysis, where organic molecules like α-amino acids, α-hydroxy acids, nucleic acids, carbohydrates are employed to catalyze organic transformations such as the aldol, Mannich and Michael reactions is a rapidly expanding field of organic synthesis. Operational simplicity, ready availability of the catalysts, selectivity, efficiency and low cost make them an attractive alternative to metal-mediated organic transformations. Although organocatalysts have many attractive features, this catalytic system also suffers from often high catalyst loading or poor solubility of the catalyst in organic solvents. Recently, ionic liquids, PEG, montmorillonite clays have been demonstrated to be good supports helping to overcome the limitations mentioned. These supported systems offer accepatble trade-offs in terms of yields and selectivity with the added advantages of recyclability of the catalyst. This review compares various supported and unsupported aminocatalysts mainly focusing on C-C bond forming reactions.
3
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An Improved Protocol for the Preparation of New 1, 2, 3 Triazolium Based Ionic Liquids and their Application as solvent for Aldol reaction

100%
Srivastava V.
Asymmetric Catalysis
|
2013
|
vol. 1
|
issue 1
EN
Microwave heating was used to synthesise different types of 1, 2, 3 triazolium based ionic liquids (5a-j) with good yield in reduced time. These ionic liquids were further screened as reaction medium for Aldol reaction using two different most promising organocatalysts; proline and proline tetrazole. In both cases, Aldol products were obtained in good yield and selectivity with each ionic liquid. It is important to notify that all the ionic liquids (5a-j) offer 5 times recyclability with our catalytic system (Proline or Proline tetrazole).
4
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A Modified Protocol for the Aldehyde Olefination Reaction using Ionic liquid as Reaction Medium

100%
Srivastava V.
|
2012
|
vol. 67
|
issue 1-2
123-129
EN
[Ru(COD)Cl2]n /CuCl2.2H2O/LiCl catalytic system was found highly active in ionic liquid medium for aldehyde olefination reaction in term of yield and selectivity. Aromatic aldehydes with more electron-donating groups on the phenyl ring gave higher yield than those with electron withdrawing groups. Reduced reaction time as well as 5 times recycling of catalytic system reflects the importance of this modified process.
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