Bromine Substitution of Organic Modifiers Fixed on a Titanium(IV) Oxide Photocatalyst: A New Strategy Accelerating Visible Light-Induced Hydrogen-Free Hydrogenation of Furfural to Furfuryl Alcohol was written by Yamamoto, Yuhei;Toda, Hibiki;Tanaka, Atsuhiro;Kominami, Hiroshi. And the article was included in ChemCatChem in 2022.Formula: C7H7ClO This article mentions the following:
Titanium(IV) oxide (TiO2) modified with 2,3-naphthalenediol (NDO) works as a photocatalyst for some reactions under irradiation of visible light. We prepared and characterized nine kinds of organically modified TiO2 (OM/TiO2) and used OM/TiO2 for chemoselective hydrogenation of furfural (FAL) to furfuryl alc. (FOL) under irradiation of visible light without the use of hydrogen gas. All OM/TiO2 prepared in this study produced FOL and a linear relation between the reaction rate and amount of FAL adsorbed on the OM/TiO2 was observed Among them, OM/TiO2 having bromine (Br)-substituted NDO exhibited larger reaction rates and the rate increased with an increase in the number of Br groups. In the case of the most active 1,4,6-tribromo-2,3-naphthalenediol-modified TiO2 (TB-NDO/TiO2), the reaction rate was not dependent on the amount of TB-NDO and the photoabsorption of TB-NDO/TiO2 but was dependent on the amount of FAL adsorbed on TB-NDO/TiO2. These results revealed that substitution of hydrogen atoms of organic modifiers with Br is a simple but effective method for increasing the photocatalytic activity. The explored TB-NDO/TiO2 also showed high performance in H2-free chemoselective reduction of benzaldehydes having reducible groups to corresponding benzyl alcs. In the experiment, the researchers used many compounds, for example, (4-Chlorophenyl)methanol (cas: 873-76-7Formula: C7H7ClO).
(4-Chlorophenyl)methanol (cas: 873-76-7) belongs to alcohols. Alcohols are weak acids. The most acidic simple alcohols (methanol and ethanol) are about as acidic as water, and most other alcohols are somewhat less acidic. Converting an alcohol to an alkene requires removal of the hydroxyl group and a hydrogen atom on the neighbouring carbon atom. Dehydrations are most commonly carried out by warming the alcohol in the presence of a strong dehydrating acid, such as concentrated sulfuric acid.Formula: C7H7ClO
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts