Phenol hydroxylation using Ti- and Sn-containing silicalites

Microporous carbon molecular sieve as a novel catalyst for the hydroxylation of phenol

“…With a prolongation of reaction time, the products distribution changes with a decrease of CAT/HQ ratio, especially at 295 K. It is obvious that benzoquinone is the dominant products at the early stage of the reaction, and the selectivity to p-benzoquinone decreases with prolonging reaction time. This phenomenon is similar to the observations over some reported zeolite catalysts [47,48] or metal complex oxide catalysts [19,22]. It is proposed that at the early reaction stage, a fast oxidation of hydroquinone in the reaction medium with relatively high concentration of H 2 O 2 might cause the formation of p-benzoquinone in relatively large amount.…”

Synthesis and Catalytic Activity of Cu(II), Fe(III) and Bi(III) Complexes of Thio-Schiff Base Encapsulated in Zeolite-Y for Hydroxylation of Phenol

“…Comparing the catalytic activity of our catalysts with other metal encapsulated complexes in zeolite-Y analogues [46][47][48][49][50], our catalysts show lower conversation but superior selectivity towards catechol formation. Compared with TS-2, our catalysts (except Bi-based catalyst) are found to exhibit higher conversion of phenol (11-18 vs. 9.3%) [51], but lower than TS-1 [52][53][54]. On the other hand [CuL 2 (H 2 O) 2 ]-Y show comparable activity to that of TS-1 [55] and microand nanometer sized TS-1 [56] using acetone as solvent.…”

A New Environmentally Benign Catalytic Process for the Asymmetric Synthesis of Lactones: Synthesis of the Flavouring δ‐Decalactone Molecule

“…[5] However, when the results are compared with titanium incorporated into the same molecular sieve the titanium-containing materials always perform better [3b] or much better. [6] Sn-Beta however, was found to be particularly active for Meerwein±Ponndorf À Verley and Oppenauer reactions in which carbonyl groups are reduced and alcohols are oxidised. [7] With respect to epoxidation only the oxidation of the very reactive norbornene has been reported with tert-butyl hydroperoxide as oxidant and Sn-MCM-41 as catalyst, while Sn-Beta was found to be absolutely inactive for epoxidation reactions with hydrogen peroxide.…”