CSIR Central


Field	Value

Creator	Motokura, Ken Viswanadham, Nagabhatla Dhar, G.Murali Iwasawa, Yasuhiro

Date	2010-07-30T06:06:30Z 2010-07-30T06:06:30Z 2010-07-30T06:06:30Z

Identifier	Catalysis Today 141 (2009) 19-24 http://hdl.handle.net/123456789/730

Description	Silica-supported amines (Si02-NR2) were found to be excellent heterogeneous catalysts for various organic C-C coupling reactions, namely cyanation, Michael reaction, and nitro-aldol reaction. A wide variety of substrates, such as aromatic, heteroaromatic, aliphatic, and cyclic carbonyl compounds, can be efficiently converted into the corresponding cyano-O-ethoxycarbonylation products. The SiOrNR2 also promoted Michael reaction of ethyl cyanoacetae with cyclohexen-1-one and nitro-aldol reaction of nitromethane with benzaldehyde. These reactions proceeded on the catalyst surfaces, and the SiOrNR2 catalysts were able to be reused without any significant loss of catalytic performance. Notably, these reactions were hard to occur either with amines alone or on the Si02 alone, which indicates a dual activation mechanism of basic amine group and surface silanol.ln addition, amines immobilized on more acidic support of silica-alumina showed higher catalytic performances than that of the Si02-NR2.

Language	en_US

Subject	SiO, surface Amine Immobilization Bifunctional Catalysis Base Acid

Title	Creation of acid-base bifunctional catalysis for efficient C-C coupling reactions by amines immobilization on SiOz, silica-alumina, and nano-H-ZSM-S

Type	Article