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N‐Doped Yellow TiO 2 Hollow Sphere‐Mediated Visible‐Light‐Driven Efficient Esterification of Alcohol and N ‐Hydroxyimides to Active Esters
Author(s) -
Singha Krishnadipti,
Ghosh Subhash Ch.,
Panda Asit Baran
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900878
Subject(s) - visible spectrum , photocatalysis , alcohol , catalysis , aldehyde , aqueous solution , chemistry , titanium , nanoparticle , combinatorial chemistry , photochemistry , materials science , nanotechnology , organic chemistry , optoelectronics
Herein we report a simple synthetic protocol for N‐doped yellow TiO 2 (N‐TiO 2 ) hollow spheres as an efficient visible‐light‐active photocatalyst using aqueous titanium peroxocarbonate complex (TPCC) solution as precursor and NH 4 OH. In the developed strategy, the ammonium ion of TPCC and NH 4 OH acts as nitrogen source and structure‐directing agent. The synthesized N‐TiO 2 hollow spheres are capable of promoting the synthesis of active esters of N‐hydroxyimide and alcohol through simultaneous selective oxidation of alcohol to aldehyde followed by cross‐dehydrogenative coupling (CDC) under ambient conditions upon 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 on gram scale using the developed strategy. The catalytic activity of N‐TiO 2 hollow spheres is much superior to that of other reported N‐TiO 2 samples as well as TiO 2 with varying morphology.