Ru–PPh3@porous organic polymer: efficient and stable catalyst for the trickle bed regioselective hydrogenation of cinnamaldehyde

Bifunctional Ru‐loaded Porous Organic Polymers with Pyridine Functionality: Recyclable Catalysts for N‐Formylation of Amines with CO2 and H2

“…The results revealed that Ru coordinated with PPh 3 moieties, but not with pyridine moieties in Ru/POP 3 ‐Py&PPh 3 catalyst. In the solid‐state 31 P NMR spectrum of Ru/POP 3 ‐Py&PPh 3 (Figure 2e), the peak observed at 20.8 ppm can be attributed to the P atoms of the polymerized vPPh 3 coordinated to Ru, which is consistent with the literature [26] . The peak at −12.7 ppm is assignable to the phosphorus signals of PPh 3 moieties.…”

“…In the solidstate 31 P NMR spectrum of Ru/POP 3 -Py&PPh 3 (Figure 2e), the peak observed at 20.8 ppm can be attributed to the P atoms of the polymerized vPPh 3 coordinated to Ru, which is consistent with the literature. [26] The peak at À 12.7 ppm is assignable to the phosphorus signals of PPh 3 moieties. The 13 C MAS NMR spectrum exhibited two peaks at 179.7 and 126.5 ppm, corresponding to the carbon signals of the pyridine and benzene ring (Figure 2f).…”

Bifunctional Heterogeneous Ru/POP Catalyst Embedded with Alkali for the N-Formylation of Amine and CO2

“…to the P species coordinated with Ru because the 26 ppm peak is enhanced after Ru loading, which is consistent with the literature. 37 The valencies of Ru and P were determined by XPS spectra (Figure 4). The BE of P was shifted from 130.27 and 132.07 eV of PPh 3 -SO 3 Na@POPs to 130.48 and 132.36 eV of Ru-PPh 3 -SO 3 Na@POPs positively.…”

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

“…Various attempts have been made to develop a suitable catalyst system for the selective (C=C vs. C=O) hydrogenation of CAL both in the gas-phase and in the liquid-phase [16][17][18][19][20][21][22][23][24][25][26][27][28].…”

“…In general, the Pd-based catalysts are more selective towards the C=C bond hydrogenation. Pt [16], Ru [17,18], Au [19], Ir [20] and Ni-Co bimetallic [21] catalysts have been reported to be selective for the hydrogenation of C=O to unsaturated alcohol. On the other hand, Pd [12,[21][22][23][24], Ni [25], Rh [26], Pt [9], Pt-Au [9] are selective for the hydrogenation of C=C to form saturated aldehyde.…”