Abstract
This review recounts the development by the authors of the Pd-catalyzed procedures devoted to various kinds of oxidation. Starting with reactions assisted with UV light, the research has explored reactions under light-free conditions: allylic oxidation, alcohol oxidation, etherification, Wacker oxidation and dehydrogenations with, always, accompanying efforts towards mechanism determination.
Highlights
In the course of the screening of metal chlorides for the catalytic with the2020, formula oxidation of 1-indanol (20) by sodium percarbonate percarbonate (SPC) in 1,2-dichloroethane (DCE) in the presence of Adogen 464 [30], we discovered that the reaction with PdCl2 effectively occurred even in the absence of SPC
Electrospray Ionization Mass Spectrometry (ESI–MS) monitoring of the reactions showed that dinuclear palladium complexes were more involved as active catalytic intermediates than mononuclear species
Tests of complexation suggested a reoxidation of Pd occurring before the decoordination of the product. These studies associated to kinetic experiments led us to propose the catalytic cycle depicted in Scheme 12, in which intermediates having the Pd atom in mauve color correspond to clusters detected by ESI–MS
Summary
Our initial initialstudies studiesonon results our observation in the early the formation of unsaturated carbonylcarbonyl compounds from irradiation with UV light bis(μ1980s of the formation of unsaturated compounds from irradiation with. 3 -allyl)dipalladium chloro)bis(η3-allyl)dipalladium complexes in oxygenated acetonitrile 1) [1].1)That bis(μ-chloro)bis(η complexes in oxygenated acetonitrile [1]. That urged urged us to look such underunder catalytic conditions. This activity progressively led usled to result us tofor look for reactions such reactions catalytic conditions. Study a variety of Pd-catalyzed oxidations under light-free conditions. The aimThe of the present us to study a variety of Pd-catalyzed oxidations under light-free conditions. Aim of the account present is to highlight the mainthe results we obtained in the area over theover years. Account is to highlight mainthat results that we obtained in the area the years.
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