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Surfaces provide platforms for self-assembly of well-defined molecular structures.By adjusting the balance of molecular-molecular interactions and molecule-surface interactions, diverse molecular patterns can be created [1,2].Beyond molecular self-assembly, "on-surface covalent coupling" or "on-surface reaction" under ultrahigh vacuum (UHV) conditions became a new concept in the recent years to create robust, ordered molecular surface structures that may also exhibit novel properties.Some products are not possible to be synthesized by standard reactions in solutions because of high reaction barrier or low solubility [3].Important breakthroughs in the this area give a clear signal for the opening of a new avenue in realizing robust functionalized molecular surfaces and designing new catalysts for unusual chemical reactions.