YTTRIUM OXIDE: A HIGHLY EFFICIENT CATALYST FOR THE SYNTHESIS OF PYRANO[2,3-d]PYRIMIDINE DERIVATIVES IN AQUEOUS METHANOL MEDIA

Silver-Loaded Carbon and Phosphorous Co-Doped Boron Nitride Quantum Dots (Ag@CP-BNQDs) for Efficient Organic Waste Removal: Theoretical and Experimental Investigations

“…39 – 43 Another peak was observed at 1010 cm –1 due to the B–N–O vibration mode and it is also similar to the related results of BNQDs elsewhere, it may also be due to the P–O–Ag vibration mode., 39 44 – 48 Moreover, the signal at 1384 cm –1 resulted from the stretching vibration of C–O or due to the bending mode of B–OH and stretching mode of B–N., 49 50 In addition, the peak at 1659 cm –1 resulted from the vibration mode of the Ag–N bond Another peak was observed at 3242 cm –1 due to the Ag–N vibration mode as well. 42 51 52 The two peaks between 1300 and 1700 cm –1 are assigned for the heterocyclic C–N stretching vibration mode as well. 53 …”

Importance of Hybrid Catalysts toward the Synthesis of 5H-Pyrano[2,3-d]pyrimidine-2-ones/2,4-diones (Thiones)

“…R. P. Pawar et al 91 developed recyclable heterogeneous yttrium oxide (10 mol %) catalyzed synthetic protocol to synthesize 7-amino-5-phenyl-substituted-1 H -pyrano[2,3- d ]-pyrimidine-2,4(3 H , 5 H )-dione analogues 56 via treating 1 (1 mmol), 11 (1 mmol) and 12 (1 mmol) in water–methanol media at 50 °C ( Scheme 41 ). The catalyst used here was reused until three consecutive runs, after that isolated yield of 56 got decrease.…”