We report on the modulation of two-dimensional (2D) bands of Cu(111) surface-state electrons by three isostructural supramolecular honeycomb architectures with different periodicity or constituent molecules. Using Fourier-transformed scanning tunneling spectroscopy and model calculations, we resolved the 2D band structures and found that the intrinsic surface-state band is split into discrete bands. The band characteristics including band gap, band bottom, and bandwidth are controlled by the network unit cell size and the nature of the molecule-surface interaction. In particular, Dirac cones emerge where the second and third bands meet at the K points of the Brillouin zone of the supramolecular lattice.

A novel ruthenium-catalyzed oxidative alkenylation/annulation cascade reaction is described for synthesizing 3-methyleneisoindolin-1-ones. In the protocol, the N À H imidate is applied efficiently as a directing group in ruthenium-catalyzed C À H activation, generating various 3-methyleneisoindolin-1-ones with high regio-and stereoselectivity in moderate to good yields.

Rhodium-catalyzed intermolecular cyclization of benzamides and diazo compounds via C-H activation has been achieved to construct C-C/C-O bonds for the first time. The process provides a facile approach for the construction of isocoumarins and α-pyrones without the need for high temperature or adding oxidants.

A mild, efficient and regioselective CH activation‐based intermolecular redox‐neutral annulation of O‐benzoylhydroxylamines and internal alkynes has been achieved. The protocol employs an ON bond as the internal oxidant and leads to isocoumarins and α‐pyrones.

A Rh(III)-catalyzed coupling/cyclization cascade reaction is described, which involves arylimidates and diazo compounds and proceeds via intermolecular C-C bond formation and subsequent intramolecular C-N bond formation. Mechanistic investigation revealed that the reaction is a two-step process: the initial Rh(III)-catalyzed coupling/cyclization proceeds very fast and the following dehydration is rather slow. The reaction provides a direct approach to isoquinolines and isoquinolin-3-ols without any oxidants.