Abstract: The catalytic oxidation of 2-methyl-1-naphthol (MNL) to 2-methyl-1,4-naphthoquinone (MNQ; menadione; vitamin K3) using aqueous H2O2 as an oxidant and hydrothermally stable mesoporous mesophase titanium silicates Ti-MMM-2 as catalysts has been studied. The effects of mesopore diameter, temperature, solvent nature, reagent concentrations, and catalyst amount on the yield of MNQ were evaluated. Crucial factors affecting the MNQ yield include MNL concentration, H2O2/MNL molar ratio, reaction temperature, and the mode of MNL addition to the reaction mixture. Selectivity dramatically decreases with increasing MNL concentration and decreasing temperature. Stepwise addition of the substrate to the reaction mixture improves selectivity. Oxidation in the presence of 18O2 provided 96.2±0.1% of unlabeled MNQ, indicating H2O2 as an oxygen source. The Ti-MMM-2 catalyst allows one to obtain MNQ with selectivity as high as 78% at complete substrate conversion. The catalyst can be used repeatedly without loss of either activity or selectivity. The proposed method is convenient and environmentally benign.

Cite: Kholdeeva O.A. , Zalomaeva O.V. , Shmakov A.N. , Melgunov M.S. , Sorokin A.B.
Oxidation of 2-Methyl-1-Naphthol with H2O2 over Mesoporous Ti-MMM-2 Catalyst
Journal of Catalysis. 2005. V.236. N1. P.62-68. DOI: 10.1016/j.jcat.2005.09.022 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	Jul 15, 2005
Accepted:	Sep 19, 2005
Published online:	Oct 17, 2005
Published print:	Nov 15, 2005

Identifiers:

Web of science:	WOS:000233281900008
Scopus:	2-s2.0-27644476264
Elibrary:	13489557
Chemical Abstracts:	2005:1165809
Chemical Abstracts (print):	144:71454
OpenAlex:	W1988023242

Citing:

DB	Citing
Web of science	45
Scopus	48
Elibrary	46
OpenAlex	44

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