Table 1.

Substrate scope for Pd–ZnO–Scb-catalyzed Heck coupling reaction.^a

Entry	X	R	Time (h)	Yield (%)b
1	I	4-OMe	1.5	95
2	I	4-Me	2	93
3	I	3-NO2	2	92
4	Br	4-Me	3	91
5	Br	4-OMe	2	94
6	Br	4-CN	1.5	96
7	Br	4-NO2	1.5	98
8	Br	3-NO2	2.5	93
9	Br	H	2	94
10	Cl	4-OMe	5	75
11	Cl	4-Me	6	63

^aReaction conditions: Aryl halides (1 mmol), Na₂CO₃ (2 mmol), styrene (1.5 mmol), 15 mg of Pd–ZnO–Scb, and DMF (4 mL) at 120 °C.

^bIsolated yield.