Scientific Reports

Table 1 Optimization conditions of Fe₃O₄@void@C-Schiff-base/Pd catalyst amount, solvent, and temperature on model reaction.

From: RETRACTED ARTICLE: Fe₃O₄@void@C-Schiff-base/Pd yolk-shell nanostructures as an effective and reusable nanocatalyst for Suzuki coupling reaction


Entry	Solvent	Base	Cat (g)	T(°C)	t [min]	Yield [%]^a
1	H₂O	K₂CO₃	–	60 oil bath	540	–
2	H₂O	K₂CO₃	0.001	60	90	90%
3	H₂O	K₂CO₃	0.003	60	60	95%
4	H₂O	K₂CO₃	0.005	60	50	98%
5	H₂O	K₂CO₃	0.01	60	50	98%
6	H₂O	K₂CO₃	0.005	rt	360	Trace
7	H₂O	K₂CO₃	0.005	40	240	58%
8	H₂O	K₂CO₃	0.005	50	180	70%
9	H₂O	K₂CO₃	0.005	80	50	98%
10	H₂O	Na₂CO₃	0.005	60	60	76%
11	H₂O	NEt₃	0.005	60	60	58%
12	H₂O	NaOH	0.005	60	60	43%
13	H₂O	Free base	0.005	60	60	Trace
14	EtOH	K₂CO₃	0.005	60	60	93%
15	EtOH/H₂O	K₂CO₃	0.005	60	60	97%
16	Toluene	K2CO3	0.005	60	60	50%
17	DMSO	K₂CO₃	0.005	60	60	58%
18	DMF	K₂CO₃	0.005	60	60	55%
19	CCl₄	K₂CO₃	0.005	60	60	43%
20^b	H₂O	K₂CO₃	0.005	60	60	50
21^c	H₂O	K₂CO₃	0.005	60	60	–
22^d	H₂O	K₂CO₃	0.005	60	60	–

Reaction condition: iodobenzene (0.5 mmol,), phenylboronic (0.75 mmol), base (1 mmol) and solvent (3 mL).
^aIsolated yields. ^bOil bath. ^cCatalyst: Fe₃O₄@viod@-PrNH₂. ^dCatalyst: Fe₃O₄@Void@C.
Significant values are in bold.

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