13127-88-3Relevant articles and documents
Mechanistic Insights into Rhenium-Catalyzed Regioselective C-Alkenylation of Phenols with Internal Alkynes
Murai, Masahito,Yamamoto, Masaki,Takai, Kazuhiko
supporting information, p. 15189 - 15197 (2019/11/16)
A (μ-aryloxo)rhenium complex was isolated and confirmed as a key precatalyst for rhenium-catalyzed ortho-alkenylation (C-alkenylation) of unprotected phenols with alkynes. The reaction exclusively provided ortho-alkenylphenols; the formation of para or multiply alkenylated phenols and hydrophenoxylation (O-alkenylation) products was not observed. Several mechanistic experiments excluded a classical Friedel–Crafts-type mechanism, leading to the proposed phenolic hydroxyl group assisted electrophilic alkenylation as the most plausible reaction mechanism. For this purpose, the use of rhenium, a metal between the early and late transition metals in the periodic table, was key for the activation of both the soft carbon–carbon triple bond of the alkyne and the hard oxygen atom of the phenol, at the same time. ortho-Selective alkenylation with allenes also provided the corresponding adducts with a substitution pattern different from that obtained by the addition reaction with alkynes.
Platinum catalyzed H-D exchange reaction of various aromatic compounds under hydrothermal condition
Yamamoto, Mitsuru,Oshima, Koichiro,Matsubara, Seijiro
, p. 353 - 359 (2007/10/03)
Various aromatic compounds were treated with deuterium oxide under hydrothermal conditions in the presence of a catalytic amount of platinum (IV) oxide. An efficient H-D exchange reaction was observed, which gave various deterium labeled aromatic compounds.
Efficient H-D exchange of aromatic compounds in near-critical D2O catalysed by a polymer-supported sulphonic acid
Boix, Carmen,Poliakoff, Martyn
, p. 4433 - 4436 (2007/10/03)
Hydrogen atom exchange of aromatic compounds in neutral near-critical D2O has been improved by using a polymer-supported sulphonic acid catalyst. Phenol, aniline, quinoline, and substituted aromatic hydrocarbons are selectively ring-perdeuterated in high yields with insignificant by-product formation at 325 °C for 24 h in D2O/Deloxan.