A Clean and Selective Radical Homocoupling Employing Carboxylic Acids with Titania Photoredox Catalysis
作者:David W. Manley、John C. Walton
DOI:10.1021/ol502625w
日期:2014.10.17
A titania photoredox catalysis protocol was developed for the homocoupling of C-centered radicals derived from carboxylicacids. Intermolecular reactions were generally efficient and selective, furnishing the desired dimers in good yields under mild neutral conditions. Selective cross-coupling with two acids proved unsuccessful. An intramolecular adaptation enabled macrocycles to be prepared, albeit
The interaction of a tetracationic calixarene (TAC4) with dianionic guest (BS) in water was studied with NMR, nano-ITC and ESI-MS experiments; the convergent evidence provided by these different techniques shows that the addition of a suitable guest molecule triggers the formation of a homodimeric capsule in aqueous neutral solution.
Disclosed are multibinding compounds which are β2 adrenergic receptor agonists and are useful in the treatment and prevention of respiratory diseases such as asthma, bronchitis. They are also useful in the treatment of nervous system injury and premature labor.
Titania Nanorod-Supported Mercaptoundecanoic Acid-Grafted Palladium Nanoparticles as a Highly Reusable Heterogeneous Catalyst for Substrate-Dependent Ullmann Coupling and Debromination of Aryl Bromides
Herein, by implanting palladium nanoparticles (Pd NPs) onto titaniumdioxide (TiO2) nanorods (NRs) through 11-mercaptoundecanoic acid (MUA), we devised a robust heterogeneouscatalyst. The formation of Pd–MUA–TiO2 nanocomposites (NCs) was authenticated using Fourier transform infrared spectroscopy, powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray analysis, Brunauer–Emmett–Teller