Natural eumelanin-based porous N-doped carbon as an active bio-catalyst for base- and initiator-free aerobic oxidation of olefins and alkyl aromatic hydrocarbons

Abstract

Melanins are natural biopolymers that are non-toxic, have a wide range of distribution in different biosystems, and play significant physiological roles. Eumelanin is an indolic biopolymer with catechol and heteroatom...

Additive- and base-free tandem aerobic oxidative cleavage of olefins to esters using bifunctional mesoporous copper-incorporated Al-SBA-15

“…This result suggests that the reaction proceeds via radical intermediates. 49 This supports the conclusion drawn from the EPR analysis that the reaction proceeds via radicals. After 6 h, the 10Cu-Al-SBA-15 catalyst was removed, and the conversion of styrene was analyzed.…”

“…In recent years, there has been increased interest in olefin oxidation due to the formation of important products such as epoxides, aldehydes, and acids (Scheme 2). 49 One significant reaction is the oxidation of benzyl alcohol or styrene, which leads to benzaldehyde (BZA) forming a major product. Benzaldehyde is an important compound used in the production of fragrances, flavors, and pharmaceuticals.…”

“…Based on EPR studies and literature survey, the possible reaction pathway for oxidative esterification of styrene is shown in Scheme 6. 49,50 Cu-Al-SBA-15 interacted with O 2 to generate a radical species containing metal–oxygen bonds (M–O radical species). 32 The formed M–O radical species interacts with GVL, generating radical species on GVL at high temperature (120 °C), and the interaction initiates the formation of radicals within the liquid solution.…”