Pd‐Colloids‐Catalyzed/Ag2O‐Oxidized General and Selective Esterification of Benzylic Alcohols

Palladium colloids obtained from the degradation of Hermann–Beller palladacycle proved to be an efficient catalytic system in combination with silver oxide as a selective oxidant for the oxidative esterification of differently substituted benzyl alcohols in MeOH as solvent. Excellent reactivity exhi...

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Bibliographic Details
Published inChemistry, an Asian journal Vol. 14; no. 15; pp. 2639 - 2647
Main Authors Sable, Vaibhav, Shah, Jagrut, Sharma, Anuja, Kapdi, Anant R.
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 01.08.2019
Subjects
Alcohol
Alkynes
Benzyl alcohol
bimetallic system
Catalysis
Chemistry
Colloids
Coupling
Esterification
Functional groups
Hermann–Beller Complex
oxidative esterification
palladacycle
Palladium
Palladium colloids
Propargyl alcohol
Silver
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Summary:Palladium colloids obtained from the degradation of Hermann–Beller palladacycle proved to be an efficient catalytic system in combination with silver oxide as a selective oxidant for the oxidative esterification of differently substituted benzyl alcohols in MeOH as solvent. Excellent reactivity exhibited by the catalytic system also allowed the alcoholic coupling partner to be changed from MeOH to a wide range of alcohols having diverse functionalities. The mildness of the developed protocol also made it possible to employ propargyl alcohol as the coupling partner without any observation of any interference of the terminal alkyne. Selective oxidative coupling of a primary alcoholic functional group over secondary in the case of glycols and glycerols was also made possible using the developed catalyst system. To test the relevancy of Pd/Ag combined catalysis mixed Pd/Ag colloids were synthesized, characterized by TEM, XRD and XPS and applied to oxidative‐esterification successfully. Catalysis! Palladium colloids obtained from the degradation of Hermann–Beller palladacycle proved to be an efficient catalytic system in combination with silver oxide as a selective oxidant for the oxidative esterification of differently substituted benzyl alcohols in MeOH as solvent. Excellent reactivity exhibited by the catalytic system also allowed the alcoholic coupling partner to be changed from MeOH to a wide range of alcohols having diverse functionalities.
Bibliography:These authors contributed equally to this work.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.201900566