Fig. 1

a–d Reaction condition screening of catalytic transfer hydrogenation; GC/MS chromatograms of the reactants and products after catalytic transfer hydrogenation: e reactants; f products after 90 min. Reaction conditions: a 70 °C, APO:ammonium formate = 1:2 (w/w), catalyst dosage 3% wt; b reaction time 60 min, APO:ammonium formate = 1:2 (w/w); catalyst dosage 3% wt; c 70 °C, reaction time 60 min, catalyst dosage 3% wt; d 70 °C, reaction time 60 min, catalyst dosage 3% wt