One pot synthesis of chromium incorporated SBA-16 under acid medium-Application in the selective oxidation of benzyl alcohol derivatives was written by AlDhawi, Zainah A.;Alomair, Nuhad A.;Kochkar, Hafedh;Revathy, Chandrasekar G.. And the article was included in Arabian Journal of Chemistry in 2022.Application In Synthesis of (4-Chlorophenyl)methanol This article mentions the following:
Cr-SBA-16 mesoporous silica heterogeneous catalysts (Si/Cr = 7, 14, and 28) were successfully synthesized by one-pot hydrothermal method at low acidic medium. The catalysts were characterized by means of X-ray diffraction, N2 adsorption-desorption at 77 K, Fourier transform IR, X-ray photoelectron and diffuse reflectance UV-Vis spectroscopies, thermogravimetric anal., SEM and transmission electron microscopy techniques. Herein, Cr-SBA-16 catalysts are evaluated in the selective catalytic oxidation of benzyl alc. derivatives using H2O2 as oxidant. From XPS and UV-Vis spectroscopies the molar ratios between Cr6+/Cr3+ are found to increase vs. chromium loading in the following order: Cr-SBA-16(28) < Cr-SBA-16(14) < Cr-SBA-16(7). Hence the highest Cr6+ in tetrahedrally environment is observed for Si/Cr = 7. We demonstrated for the first time that the selective catalytic oxidation of benzyl alc. using H2O2 over Cr-SBA-16 occurs through noncompetitive adsorption mechanism and the reaction is pseudo-first order to BzOH. The activity of the reaction depends on the symmetry of chromium species, herein, high activity is observed for tetrahedral chromium species in Cr-SBA-16(7). The absence of any chromium ions in the filtrate shows no chromium leaching from the silica framework. In the experiment, the researchers used many compounds, for example, (4-Chlorophenyl)methanol (cas: 873-76-7Application In Synthesis of (4-Chlorophenyl)methanol).
(4-Chlorophenyl)methanol (cas: 873-76-7) belongs to alcohols. The oxygen atom of the strongly polarized O―H bond of an alcohol pulls electron density away from the hydrogen atom. This polarized hydrogen, which bears a partial positive charge, can form a hydrogen bond with a pair of nonbonding electrons on another oxygen atom. Secondary alcohols are easily oxidized without breaking carbon-carbon bonds only as far as the ketone stage. No further oxidation is seen except under very stringent conditions.Application In Synthesis of (4-Chlorophenyl)methanol
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts