Abstract
A stable, earth-abundant, reusable cobalt-based heterogeneous catalyst is developed for the oxidative esterification of alcohols under ambient conditions, featuring broad substrate scope, providing good to excellent product yields. This protocol enables easy recyclability of the catalyst, measured up to five times without significant loss of efficiency. The active sites of Co-N-Si/AC are proposed to be Co-N species.
Highlights
Esters are a significant part of the building blocks in organic synthesis that are widely applied in pharmaceuticals, fine chemicals, natural products, fragrances and commercial products [1]
Direct oxidative esterification of alcohols with molecular oxygen catalyzed by heterogenous catalysts may be the most favored and promising for many reasons: (i) the use of oxygen as an oxidant reagent is green, economical and sustainable; (ii) the recyclability and reusability of heterogenous catalysts; (iii) the ease of separation; (iv) the ease of accessibility and renewability of alcohols; (v) the replacement of a noble metal with a base metal; etc
The exploration and development of efficient catalytic systems for oxidative esterification under mild conditions are of increasing interest in both green chemistry and organic synthesis
Summary
Esters are a significant part of the building blocks in organic synthesis that are widely applied in pharmaceuticals, fine chemicals, natural products, fragrances and commercial products [1]. A great deal of research effort has been devoted to developing environmentally benign and cost-effective methods for the synthesis of esters from alcohols This is accessible and of increasing importance as renewable plant-derived feedstock [2]; as alternatives for traditional protocols such as noble-metal-based homogeneous catalytic system such as gold, ruthenium, palladium and iridium [3,4,5,6,7,8,9,10,11]; and for the exploration of heterogeneous (palladium, platinum, gold, vanadium and cobalt supported) catalysts [12,13,14,15,16,17,18,19,20,21,22] (Scheme 1). The exploration and development of efficient catalytic systems for oxidative esterification under mild conditions are of increasing interest in both green chemistry and organic synthesis
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