A 4-ml screw cap vial was charged with catalyst (8.8 mg, 2.9 mol %), substrate (1.5 mmol), 1.5 ml of solvent, and a glass-coated stirring bar. The vial was closed by polytetrafluoroethylene (PTFE)/white rubber septum (Wheaton 13 mm Septa) and phenolic cap and connected with atmosphere with a needle. The vial was fixed in an alloy plate and put into a Parr 4560 series autoclave (300 ml). At room temperature, the autoclave was flushed with H2 three times and H2 was charged at the required pressure. The autoclave was placed in an aluminum block on a heating plate equipped with magnetic stirring. The reaction was heated for 18 hours. Afterward, the autoclave was cooled in an ice bath and the pressure was carefully released. For GC analysis, hexadecane (32 μl) was added into the reaction mixture as an internal standard. The mixture was diluted with ethyl acetate, stirred properly, and the organic fraction was analyzed by GC. For 1H and 13C NMR, instead of hexadecane, mesitylene (20 μl) was added into the reaction mixture as an internal standard, and 2 ml of CDCl3 was added. After proper stirring, the organic fraction was filtered through a 0.2-μm PTFE syringe filter, and both NMR and GC were measured. The obtained NMR spectra were compared with the ones reported in the literature.

Isolation of products was done by extraction with dichloromethane (DCM) or ether, followed by filtration through a 0.2-μm PTFE syringe filter. 1,1-Diphenylethane (2ao) was purified by column chromatography over silica using hexane as an eluent.

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