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Despite advances in C–H activation reactions in the past decade, the development of suitable ligands that enable catalytic C(sp3)–H bond functionalization remains a significant challenge. Here, the discovery of a mono-N-protected amino acid ligand enables Pd(II)-catalysed cross-coupling of C(sp3)–H bonds in triflyl-protected amines with arylboron reagents.
Mechanically robust and shape-persistent hollow toroidal polymer microrings have been synthesized directly by thiol-ene photopolymerization of rectangular-shaped monomers with dithiols. The size of the microrings can be tuned by varying the monomer concentration. The resulting structures can encapsulate molecules in their hollow interiors and also serve as scaffolds to template the formation of circular arrays of metal nanoparticles.
