Although hydrosulfonylation of alkynes
is an ideal process
to generate β-keto sulfones, such an approach is rarely implemented.
Here we reported a facile and efficient graphitic carbon nitride (p-g-C3N4) photocatalyzed hydrosulfonylation
of alkynes with the insertion of sulfur dioxide in aerobic conditions.
Controlled experiments and ESR results indicated both the superoxide
radicals and valence band holes played an important role in the reaction.
Further isotope experiments confirmed the oxygen atom of the products
comes from H2O, while the O2 plays an important
role in the reaction by quenching the DABCO radical cation. The metal-free
heterogeneous semiconductor is fully recyclable at least 6 times without
significant reducing activity. Furthermore, this reaction could be
carried out under solar light irradiation and was applicable for a
large-scale reaction with conserved results.
A visible-light promoted oxidative cleavage of vicinal diols by using CN620 as a recyclable photocatalyst in aerobic micellar medium has been developed.
Direct sulfonylation between alkenes and sulfonyl chloride was achieved at room temperature by a visible-light-induced photoredox process. This method allows the chemoselective synthesis of α-chloro and vinyl sulfone derivatives with moderate to high yields. The selectivity of the reaction was fully controlled by the electronic properties of the alkenes.
Bi–CoP nanoparticles supported on N, P doped defective graphene aerogel (Bi–CoP–P-DG) electrocatalyst presents excellent catalytic performances for OER, ORR and Zn–air battery. Moreover, the home-made Zn–air battery can drive overall water-splitting.
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