The development of high‐efficiency and low‐cost heterogeneous catalysts with superior selectivity for the reduction of nitro compounds is desirable. Herein, we prepared Co‐based nitrogen‐doped meso‐microporous carbon (Co/N−C) derived from polyvinylpyrrolidone (PVP)‐coated zeolitic imidazolate framework (ZIF)‐67 as a heterogeneous catalyst for the synthesis of aromatic amines via in‐situ restricted pyrolysis. The structure, morphology, and catalytic activity of Co/N−C were investigated, and the results indicated that Co/N−C‐800 has the combined advantage of the excellent catalytic activity of cobalt nanoparticles and the high mass transfer rate of the N‐doped meso‐microporous carbon framework, achieving superior catalytic ability for the selective hydrogenation of 20 representative nitroaromatic compounds. Co/N−C‐800 was recyclable by simple separation due to the strong magnetism of the Co nanoparticles and exhibited excellent reusability, with 100 % yield of aniline even after six cycles. The catalytic reduction may be attributed to the dissociation of hydrazine to H+/H− via the action of Co/N−C.
We present an environment-friendly and highly efficient method for the oxidation of aromatic alcohols to carboxylic acids or ketones in air via light irradiation under external catalyst-, additive-, and base-free conditions. The photoreaction system exhibits a wide substrate scope and the potential for large-scale applications. Most of the desired products are easily obtained via recrystallization and separation from low-boiling reaction medium acetone in good yields, and the products can be subsequent directly transformed without further purification.
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