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RISWeighted and flexible versions of block CMRH method for solving nonsymmetric linear systems with multiple right-hand sides
سال: 2018
خلاصه:
Block Krylov subspace methods are the most popular algorithms for solving large nonsymmetric
linear systems with multiple right-hand sides. One of them is the block CMRH
method. This method generates a (non ...
A novel and efficient synthesis of 3,3-disubstituted indol-2-ones via Passerini three-component reactions in the presence of 4 Å molecular sieves
سال: 2013
خلاصه:
The Passerini coupling of cyclohexylisocyanide with isatins and carboxylic acids in the presence of 4 Å
molecular sieves is described. This process offers a highly efficient and atom-economic access to 3-acyloxy-< ...
An efficient synthesis of 3-cyano-3-benzoyloxyoxindoles via cyanoacylation of isatins in the presence of 4 Å molecular sieves
سال: 2012
خلاصه:
In the presence of 4 Å molecular sieves in CH3CN, a process for the cyanobenzoylation and cyanocarbonylation
of isatins with benzoycyanides and ethylcyanoformate under mild reaction conditions has been
developed. ...