Hua Zhang

Chemicals
References

PyHBr3/TBN/H2O as catalytic system for the oxidation of sulfides to sulfoxides with air as the oxidant

Co-reporter:Hua Zhang, Guibin Wang

Tetrahedron Letters 2014 Volume 55(Issue 1) pp:56-58

Publication Date(Web):1 January 2014

DOI:10.1016/j.tetlet.2013.10.102

Pyridinium bromide perbromide (PyHBr3) and tert-butyl nitrite (TBN) catalytic system was used for the oxidation of sulfides with air as the oxidant. Under mild conditions (at room temperature), a series of sulfide substrates have been oxidized to their corresponding sulfoxides with high conversion rate. To the best of our knowledge, for the first time, the PyHBr3/TBN/H2O is reported as exceptional catalyst system for the oxidation discussed in this Letter.

Porous Silica Beads Supported TEMPO and Adsorbed NOx (PSB-TEMPO/NOx): An Efficient Heterogeneous Catalytic System for the Oxidation of Alcohols under Mild Conditions

Co-reporter:Lei Di ;Zhang Hua

Advanced Synthesis & Catalysis 2011 Volume 353( Issue 8) pp:1253-1259

Publication Date(Web):

DOI:10.1002/adsc.201000876

Abstract

The combination of NO_x gas which is stored in the pore canals of porous silica beads (PSB) with a heterogeneous catalyst, PSB-supported 2,2,6,6-tetramethylpiperdine 1-oxyl (PSB-TEMPO, 1), afforded a highly efficient, widely applicable, and efficiently recyclable approach for the selective aerobic oxidation of alcohols. This novel catalytic system (PSB-TEMPO/NO_x) can be employed in the oxidation of a wide range of alcohols to their corresponding aldehydes and ketones with selectivities as high as 99% at complete conversions under mild conditions. O₂ is the terminal oxidant. PSB-TEMPO can be recycled for more than 10 times without significant loss of activity.