二氧化钛催化的 HO 热氧化苯乙烯醛。

Titania-Catalyzed HO Thermal Oxidation of Styrenes to Aldehydes.

机构信息

Institute for Energy and Material/Food Resources, Technology Innovation Division, Panasonic Corporation, 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan.

Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.

出版信息

Molecules. 2019 Jul 10;24(14):2520. doi: 10.3390/molecules24142520.

DOI:10.3390/molecules24142520

PMID:31295835

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6680574/

Abstract

We investigated the selective oxidation of styrenes to benzaldehydes by using a non-irradiated TiO-HO catalytic system. The oxidation promotes multi-step reactions from styrenes, including the cleavage of a C=C double bond and the addition of an oxygen atom selectively and stepwise to provide the corresponding benzaldehydes in good yields (up to 72%). These reaction processes were spectroscopically shown by fluorescent measurements under the presence of competitive scavengers. The absence of the signal from OH radicals indicates the participation of other oxidants such as hydroperoxy radicals (•OOH) and superoxide radicals (•O) into the selective oxidation from styrene to benzaldehyde.

摘要

我们研究了在未经辐照的 TiO-HO 催化体系中，通过选择性氧化苯乙烯制备苯甲醛的反应。该氧化反应促进了多步反应，包括 C=C 双键的断裂和氧原子的逐步选择性加成，从而以良好的收率（高达 72%）得到相应的苯甲醛。这些反应过程通过荧光测量在竞争性清除剂存在的情况下进行了光谱显示。由于不存在羟基自由基的信号，表明其他氧化剂（如过氧氢自由基（•OOH）和超氧自由基（•O））参与了从苯乙烯到苯甲醛的选择性氧化反应。