Esterification of Aldehydes and Alcohols with Pyridinium Hydrobromide Perbromide in Water
作者:Shinsei Sayama、Tetsuo Onami
DOI:10.1055/s-2004-835630
日期:——
The direct esterification of aldehydes and alcohols was carried out with pyridinium hydrobromide perbromide in water at room temperature. A variety of aldehydes were converted to respective ester derivatives with alcoholssuch as methanol, 1,2-ethanediol, 1,3-propanediol. Further, a variety of aliphatic alcohols were also converted to the corresponding Tishchenko-like dimeric esters in good yields under
Aerobicoxidation of aldehydes to 1,2‐ and 1,3‐diol monoesters was catalyzed by polymer‐incarcerated gold nanoclusters under ambient conditions. The esterification proceeded much faster with 1,2‐ and 1,3‐diols and their derivatives rather than with methanol.
Fast Addition of s‐Block Organometallic Reagents to CO
<sub>2</sub>
‐Derived Cyclic Carbonates at Room Temperature, Under Air, and in 2‐Methyltetrahydrofuran
作者:David Elorriaga、Felipe Cruz‐Martínez、María Jesús Rodríguez‐Álvarez、Agustín Lara‐Sánchez、José Antonio Castro‐Osma、Joaquín García‐Álvarez
DOI:10.1002/cssc.202100262
日期:2021.5.6
straightforward synthesis of: highly substituted tertiary alcohols, β‐hydroxy esters, or symmetric ketones, working always under air and at room temperature. Finally, an unprecedented one‐pot/two‐step hybrid protocol is developed through combination of an Al‐catalyzed cycloaddition of CO2 and propylene oxide with the concomitant fast addition of RLi reagents to the in situ and transiently formed cyclic carbonate
Efficient and Simple Approaches Towards Direct Oxidative Esterification of Alcohols
作者:Ritwika Ray、Rahul Dev Jana、Mayukh Bhadra、Debabrata Maiti、Goutam Kumar Lahiri
DOI:10.1002/chem.201403786
日期:2014.11.17
The present article describes novel oxidative protocols for directesterification of alcohols. The protocols involve successful demonstrations of both “cross” and “self” esterification of a wide variety of alcohols. The cross‐esterification proceeds under a simple transition‐metal‐free condition, containing catalytic amounts of TEMPO (2,2,6,6‐tetramethyl‐1‐piperidinyloxy)/TBAB (tetra‐n‐butylammonium
Oxidative esterification of benzylic alcohols with a catalytic amount of HBr-H2O2 in aqueous medium under mild conditions is reported with a wide range of substrate scope for both benzylic and aliphatic alcohols. The conditions are also suitable for selective mono-esterification of ethylene glycol and glycerol. With catalytic amounts of HBr (20 mol%) and H2O2, the generation of reactive intermediate species BrOH has been ascertained by UV-visible spectra.