N-doped Yellow TiO2 hollow sphere mediated visible light driven efficient esterification of alcohol and N-Hydroxyimides to active esters

Chemistry, an Asian Journal
Asit Baran PandaSubhash Ch Ghosh

Abstract

Herein we report a simple synthetic protocol for N-doped yellow TiO2 (N-TiO2) hollow sphere as an efficient visible light active photocatalyst using aqueous titanium peroxocarbonate complex (TPCC) solution as precursor and NH4OH. In the developed strategy, the ammonium ion of TPCC and NH4OH act as nitrogen source and structure directing agent. The synthesized N-TiO2 hollow sphere is capable of synthesizing active esters of N-hydroxyimide and alcohol through simultaneous selective oxidation of alcohol to aldehyde followed by cross-dehydrogenative coupling (CDC) under the ambient condition on irradiation of visible light. It is possible to develop a novel and cost-effective one-pot strategy for the synthesis of important esters and amides in gram scale using the developed strategy. The catalytic activity of N-TiO2 hollow sphere is much superior to that of other reported N-TiO2 as well as TiO2 with varying morphology.

References

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