Calix 4 resorcinarene Cored Dendrimers Novel Platforms for Catalytic Applications

Abstract

Catalysis is definitely a potent tool for enhancing the viability of newlinechemical processes. Berzelius used the term quotcatalysisquot in 1836 to newlinedescribe some chemical compounds unique abilities to influence newlinevarious chemical changes. Since the advent of the concept of catalysis, newlinenumerous catalysts were developed to enhance the sustainability of newlinechemical processes. In modern organic synthesis, enzyme catalysis, newlineheterogeneous catalysis, and organocatalysis are considered as green newlinebecause of their environment friendliness. newlineNow-a-days, organocatalysis is one of the most favored research newlinetopics in advanced organic chemistry. It is a novel synthetic philosophy newlineand mostly an alternative to the prevalent transition metal catalysis. newlineHeterogeneous organocatalysts are potent organic molecules that can newlineachieve chemical transformations in an environmentally benign manner. The newlinefascinating feature of heterogeneous catalysts is their ease of separation from newlinethe reaction mixture. The dendrimers are nanoreactors with multivalent newlinesurfaces suitable for catalysis and they bridge the gap between heterogeneous newlineand homogeneous catalysis. Chemically modified dendrimers are good newlinecandidates for catalysis in terms of their high efficiency, selectivity and good newlinecatalytic activity. The main advantages of dendrimer based catalysts are: (1) newlinedue to their ability to encapsulate a specified amount of metal ions via newlinecoordination, dendritic framework provides better resistance to metal newlineleaching (2) enhancing substrate selectivity by selecting the right dendrimer newlinegeneration or by functionalization and (3) the recyclability of the newlinedendrimer based catalysts due to their large size. newline