PS-PPh2 tethered Pt single atoms promoted by SnCl2 as highly efficient and regio-selective catalysts for the hydroformylation of higher α-alkenes
Rh-P complexes have been widely used as catalysts for hydroformylation reactions.The extremely high price of Rh and its scarce reserves have prompted the exploration of the alternatives.In this study,we reported that Pt/PS-PPh2 single-atom catalysts promoted by SnCl2 were highly efficient and selective for the hydroformylation of higher a-alkenes.A broad scope of substrates(i.e.,C6-C12)were smoothly converted to the corresponding linear aldehydes with high yields under reaction conditions of 90-120 ℃ and 4-6 MPa syngas.The turnover frequency(TOF)was comparable to homogeneous Pt-Sn catalysts,and the linear/branched ratio reached as high as＞20.In addition,the catalyst could be reused with the extra addition of SnCl2.The promotional role of SnCl2 was eluci-dated by quasi-in situ X-ray adsorption fine structure,Fourier transform infrared,and Mössbauer spectroscopy.It was discovered that SnCl2 was transformed into Sn(dioxane)Cl3-species coordi-nated to Pt as a moderately electron-donating ligand,which,together with the phosphine group,stabilized mononuclear Pt(I)species against reduction and aggregation.
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