苯以高收率和高选择性直接羟基化制苯酚一直是苯酚工业生产的目标。光催化由于其具有成本效益和环境友好性,可以作为实现苯羟基化为苯酚的竞争方法,但同时获得良好的产率、高选择性和高原子利用率仍然是一个艰巨的挑战。在这里,我们展示了一系列基于烷氧六钒酸盐阴离子和喹啉离子的超分子催化剂,用于在紫外线照射下将苯光催化羟基化为苯酚。我们证明了聚氧烷氧钒酸盐可以作为有效的催化剂,不仅可以稳定喹啉自由基,还可以再利用 H 2 O 2 由喹啉离子在光照射下产生以获得优异的协同效应,包括具有竞争力的良好产率(50.1 %)、高选择性(> 99 %)和高原子可用性。
Copper-catalyzed selective difunctionalization of N-heteroarenes through a halogen atom transfer radical process
作者:Hui-Lin Fang、Qiu Sun、Rong Ye、Jing Sun、Ying Han、Chao-Guo Yan
DOI:10.1039/c9nj03471d
日期:——
A highly regioselective Cu-catalyzed difunctionalization of different N-heteroarene salts such as quinolinium and benzothiazolim salts was developed with ether and X− (X = Br, Cl) as the halogen source under mild conditions. This transformation involved the combination of oxidative coupling, selective free radical resonance and a copper-catalyzed halogen atom-transfer radical process. The regiochemistry
Alkylation of Rhodium Porphyrins Using Ammonium and Quinolinium Salts
作者:Samuel J. Thompson、Guangbin Dong
DOI:10.1021/om500438s
日期:2014.7.28
Alkylation of rhodium(III) porphyrins [Rh-II(por)] was achieved under relatively mild conditions in up to 98% yields, where readily available ammonium and quinolinium salts were utilized as the alkylating agents. This transformation tolerates air and water, thus serving as a convenient method to prepare a variety of alkyl- and benzyl-Rh-III(por) complexes. Preliminary mechanistic studies support an S(N)2-like reaction pathway involving a Rh-I(por) anion intermediate.
Kost; Judin, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 1720; engl. Ausg. S. 1929
作者:Kost、Judin
DOI:——
日期:——
Base-catalyzed monofunctionalization of N-alkyl activated azaarenes to construct 2-Iminoderivatives