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Metal-organic frameworks (MOFs) as chemical sensors have developed rapidly in recent years. There have been many papers concerning this field and interest is still growing. The reason is that the specific merits of MOFs can be utilized to enhance sensitivity and selectivity by various energy/charge transfers occurring among different ligands, ligand, and metal centers, such as from ligands to metal centers or metal centers to ligands, as well as from MOF skeletons to guest species. This review intends to provide an update on recent progress in various applications of different MOF-based sensors on the basis of their luminescent and electrochemical responses towards small molecules, gas molecules, ions (cations and anions), pH, humidity, temperature, and biomolecules. MOF-based sensors function by utilizing different mechanisms, including luminescent responses of "turn-on" and "turn-off", as well as electrochemical responses.

The mild conditions can be applied to a broad spectrum of alcohol substrates and extended to phenol (XIII) and dione (XV).

The regioselectivity of the present method is based on the N—O group as the directing moiety.

Depending on the organoboron compound used, either 1,3-diarylpropenes or 3-arylalkylacetates are selectively accessible by the present protocol.