Table 3.

Screening of photocatalysts for the visible light-mediated coupling of benzenediazonium tetrafluoroborate (1a) and CS₂ (2).^a

Entry	2 (equiv)	photocatalyst	solvent	Yield 3a (%)b
1	0.5	Ru(bpy)3(PF6)2	DMSO	42
2	1	Ru(bpy)3(PF6)2	DMSO	47
3	1.5	Ru(bpy)3(PF6)2	DMSO	53
4	2	Ru(bpy)3(PF6)2	DMSO	88
5	2.5	Ru(bpy)3(PF6)2	DMSO	55
6	3	Ru(bpy)3(PF6)2	DMSO	57
7	–	Ru(bpy)3(PF6)2	CS2	n.d.
8	2	Ru(bpy)3Cl2	DMSO	65
9	2	Ir(ppy)3	DMSO	57
10	2	Ir(ppy)2(bpy)(PF6)	DMSO	73
11	2	Ir(ppy)2(dtbbpy)(PF6)	DMSO	8
12	2	none	DMSO	53

^aReaction conditions: 1a (0.1 mmol), photocatalyst (0.001 mmol), blue light (20 W), solvent (2 mL), rt, 6 h; ^byields were determined by HPLC using 3a as the external standard.