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Silica‐Immobilized Highly Dispersed Oxo–Rhenium and its Catalytic Activity for the Direct Synthesis of Nitrones
Author(s) -
Singh Bhawan,
Jain Suman L.,
Rana Bharat S.,
Khatri Praveen K.,
Sinha Anil K.,
Sain Bir
Publication year - 2010
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201000121
Subject(s) - rhenium , catalysis , chemistry , hydrogen peroxide , mesoporous silica , covalent bond , organic chemistry , mcm 41 , leaching (pedology) , heterogeneous catalysis , amine gas treating , mesoporous material , combinatorial chemistry , environmental science , soil science , soil water
A novel covalently attached silica‐immobilized oxo–rhenium catalyst was prepared by the reaction of perrhenic acid and 3‐chloropropyl functionalized mesoporous SBA‐15, in which the oxo–rhenium species is chemically bonded to the support, preventing leaching. The prepared silica‐immobilized oxo–rhenium was found to be an efficient and recyclable catalyst for the one‐pot condensation/oxidation of aldehydes and primary amines to nitrones in high yields using urea–hydrogen peroxide as a terminal oxidant under mild reaction conditions.