Co3O4 of regular cubic shape as high-efficiency catalyst for the preparation of lactones through the Baeyer–Villiger oxidation of cyclic ketones with dioxygen

Nano silica boron sulfuric acid as a dual Brønsted/Lewis acid and a heterogeneous catalyst in Baeyer–Villiger oxidation of ketones with hydrogen peroxide

“…Compared with the others, although dioxygen/benzaldehyde is an interesting approach and supplies good yields and times, but this protocol needs at least two or three equivalents of aldehyde per one equivalent of starting ketone. In addition, this combination also produces a peracid in situ, and once again we encounter to the aforementioned drawbacks of peracids [12][13][14]. Moreover, according to our literature survey, though many of the reported oxidative catalytic system of ketones, are powerful and efficient in oxidation of cyclic ketones, but most of them are unsuccessful or very weak in the oxidation of aromatic or acyclic ketones, whereas this work is more successful and shows a good versatility [6,12,29,[32][33][34].…”

“…In addition, this combination also produces a peracid in situ, and once again we encounter to the aforementioned drawbacks of peracids [12][13][14]. Moreover, according to our literature survey, though many of the reported oxidative catalytic system of ketones, are powerful and efficient in oxidation of cyclic ketones, but most of them are unsuccessful or very weak in the oxidation of aromatic or acyclic ketones, whereas this work is more successful and shows a good versatility [6,12,29,[32][33][34]. Consequently, we can claim that by using H 2 O 2 with a high content of oxygen as an environmentally benign and commercially available, inexpensive and easy to handle oxidant with a heterogeneous Brønsted/Lewis acid catalyst allows a cleaner and more sustainable oxidation process of ketones to either esters or lactones, the oxidizing agent produces water as an environmentally friendly by-product and the …”

“…Consequently, a lot of efforts have been focused on finding out of less dangerous and greener alternatives such as oxygen/aldehydes, hydrogen peroxide/carboxylic acids, hydrogen peroxide/acids or bases and also bio-oxidants, etc. [6][7][8][9][10][11][12][13][14]. Hydrogen peroxide with a high content of oxygen (47 wt%) is a commercially available, inexpensive and environmentally benign reagent, which simplifies greatly the workup and, contrary to peracids, avoids the separation of the carboxylic acid salt as the by-product.…”

Efficient Catalysis of the Aerobic Baeyer–Villiger Oxidation over a Bifunctional Catalyst Based on Cobalt Tetraphenylporphyrin Intercalated into Zn2Al Hydrotalcite

“…[7] Various materials have been introduced to catalyze the B-V oxidation with molecular oxygen, but most of the catalysts can only catalyze one of the two steps. The catalysts for the first step consist of metallo complexes, [8] active carbon, [2] transitionmetal ions or their oxides, [9] and metals in various supports. [10] Actually, it is well known that metallo complexes including metalloporphyrins, which are biomimetic catalysts for P450, have excellent performance in the oxidation of various substrates.…”

“…[8-10, 13, 14] In addition, high conversion and selectivity are obtained when the temperature is 40 8C, which is also lower than typical reported work. [2,[8][9][10][11][12][13][14] The present oxidation system could be attractive if it can be applied to various ketones. Table 2 shows the B-V type aerobic oxidation of various ketones in the presence of CoTSPP-Zn 2 Al-LDH and benzaldehyde.…”