Premium
Heterogeneous Light‐Mediated Reductive Dehalogenations and Cyclizations Utilizing Platinum Nanoparticles on Titania (PtNP@TiO 2 )
Author(s) -
McTiernan Christopher D.,
Pitre Spencer P.,
Ismaili Hossein,
Scaiano Juan C.
Publication year - 2014
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201400547
Subject(s) - chemistry , catalysis , platinum nanoparticles , platinum , photochemistry , visible spectrum , nanoparticle , combinatorial chemistry , inert , nanotechnology , chemical engineering , organic chemistry , materials science , optoelectronics , engineering
Abstract The utility of platinum nanoparticles on titania (PtNP@TiO 2 ) as a heterogeneous photoredox catalyst is evaluated using a series of reductive transformations. In comparison to TiO 2 alone, TiO 2 decorated with 0.2% PtNP shows enhanced efficiency, attributed to the NPs ability to both enhance light absorption and inhibit electron‐hole pair recombination. Herein, we demonstrate that under an inert atmosphere and UVA/visible light irradiation a system consisting of our PtNP@TiO 2 catalyst in conjunction with a sacrificial electron donor [diisopropylethylamine, ( i‐ Pr) 2 NEt] can promote a variety of different reductive dehalogenations and cyclizations in moderate to excellent yields. In addition, the catalytic system is tolerant of many different functionalities and, due to its heterogeneous nature, holds the advantage of easy catalyst removal.