activator for carboxylic acids is the key to bypass a competing single‐electron‐transfer mechanism and “switch on” an energy‐transfer‐mediated homolysis of unsymmetrical σ‐bonds for a concertedfragmentation/decarboxylation process.
developed to construct PAHs with diverse shape, width, and edge topology. The precursors of PAHs were obtained by using a direct arylation of arenes via a transient ligand-directed C–H functionalization strategy and the cycloaromatization was readily achieved by using a Brønstedacid catalyst. This novel route provides an opportunity to build up PAHs in a highly efficient manner.
We report a microwave-assisted synthetic protocol for the C-S cross-coupling reaction of aryl iodides and 8-mercaptoadenine using CuI and n-Bu4NBr with NaOt-Bu in DMF. The method is rapid, simple, and cost efficient, and leads in high yields to biologically relevant aryl sulfides.
Synthetic efforts toward the preparation of rotaxaneprecursorsbased on phenylacetylenemacrocycles (PAM) are described. The aim of this study was to determine the optimal structural parameters to prepare high-molecular-weight rotaxaneprecursors through a strategy involving two Sonogashira couplings to attach bulky blockers on the PAM core. PAMs with different sizes and functions were prepared and
An amide-containing phenylacetylene macrocycle (PAM) has been synthesized and its gelation properties were studied in different solvents. Surprisingly, this macrocycle forms organogels at low concentration in many polar and apolar solvents. XRD and FTIR analysis suggest that this macrocycle forms stable supramolecular assemblies owing to H-bonding. Scanning electron microscopy analyses show the formation of bundles of nanofibrils, demonstrating the long-range organization of this material.