Ultrasound-Accelerated, Concise, and Highly Efficient Synthesis of 2-Oxazoline Derivatives Using Heterogenous Calcium Ferrite Nanoparticles and Their DFT Studies

Table 2

Substrate scope of the synthesis of various 2-oxazoline derivatives^a under ultrasound and conventional stirring.

Entry	Compounds 1a–j	Compounds 3a–j	Ultrasound irradiation (UI)		Conventional
			Time (min.)	Yield (%)^b	Time (h)	Yield (%)^b
1			45	88	9–10	85
2			20	85	5	81
3			30	70	6	60
4			40	89	7-8	87
5			45	30	18	0
6			25	90	6-7	87
7			45	85	9-10	83
8			45	86	16	81
9			20	76	4	70
10			25	50	4-5	35

^aReaction conditions: 1a–g (1 mmol), 2 (1.1 mmol), CaFe₂O₄ (10 mol%), H₂O, 50°C, and UI. ^bIsolated yield.