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CdS catalytic materials were utilized to fabricate C–C, CN and C–S bonds for drug intermediates or other value-added products through the high bond energy, low polarity and strong inertia C–H bonds activation.

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Visible-light-induced one-pot, multistep, and chemoselectivity adjustable reactions highlight the economical, sustainable, and green process. Herein, we report Pt nanoparticles dispersed on S and N co-doped titanium dioxide/titanium carbide (MXene) (3%Pt/D-TiO 2 /Ti 3 C 2 ) heterojunctions as photocatalysts for the tandem reactions between aromatic nitro compounds and alcohols to produce N-alkylated products. 3%Pt/D-TiO 2 /Ti 3 C 2 heterojunction was prepared by in situ grew TiO 2 on Ti 3 C 2 nanosheets, S and N co-doped TiO 2 with thiourea, and then Pt nanoparticles with 2.9 nm average diameter well dispersed on D-TiO 2 /Ti 3 C 2 . 3%Pt/D-TiO 2 /Ti 3 C 2 showed excellent activity and chemoselectivity to N-alkyl amines in the presence of base additive K 3 PO 4 under visible-light irradiation; interestingly the chemoselectivity almost completely switched to N-benzylideneanilines in the presence of base additive KOH. In comparison, Pt nanoparticles on S and N co-doped TiO 2 prepared from titanium carbide (3%Pt/D-TiO 2 @C) showed sharply decreased activity and chemoselectivity to N-alkyl amines or N-benzylideneanilines. The enhanced performance of 3%Pt/D-TiO 2 /Ti 3 C 2 should be attributed to the improvement in photogenerated electron and hole separation efficiency by means of charge short-range directional transmission caused by the intimate contact between the TiO 2 and the conductive Ti 3 C 2 . In situ DRIFTS spectra further verified that the substrates activation with visible-light irradiation at 25 C was much faster than heating.

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