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Salt‐Free Reduction of Nonprecious Transition‐Metal Compounds: Generation of Amorphous Ni Nanoparticles for Catalytic C–C Bond Formation
Author(s) -
Yurino Taiga,
Ueda Yohei,
Shimizu Yoshiki,
Tanaka Shinji,
Nishiyama Haruka,
Tsurugi Hayato,
Sato Kazuhiko,
Mashima Kazushi
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201507902
Subject(s) - catalysis , trimethylsilyl , toluene , salt (chemistry) , transition metal , nanoparticle , amorphous solid , aryl , transmission electron microscopy , chemistry , metal , inorganic chemistry , materials science , nuclear chemistry , alkyl , organic chemistry , nanotechnology
A salt‐free procedure for the generation of a wide variety of metal(0) particles, including Fe, Co, Ni, and Cu, was achieved using 2,3,5,6‐tetramethyl‐1,4‐bis(trimethylsilyl)‐1,4‐diaza‐2,5‐cyclohexadiene ( 1 ), which reduced the corresponding metal precursors under mild conditions. Notably, Ni particles formed in situ from the treatment of Ni(acac) 2 (acac=acetylacetonate) with 1 in toluene exhibited significant catalytic activity for reductive CC bond‐forming reactions of aryl halides in the presence of excess amounts of 1 . By examination of high‐magnification transmission electron microscopy images and electron diffraction patterns, we concluded that amorphous Ni nanoparticles (Ni aNPs) were essential for the high catalytic activity.