Table 6. Ru(0)-Catalyzed Arylation of 4a under Argon and Hydrogen^a.

entry	Ar	atmosphere	5	convb (%)	yieldc (%)
1	Ph	argon	5a	86	64
2	Ph	H2	5a	97	91
3	4-Me-Ph	argon	5f	88	62
4	4-Me-Ph	H2	5f	98	83
5	4-OMe-Ph	argon	5h	50	39
6	4-OMe-Ph	H2	5h	23	ni
7	4-CF3–Ph	argon	5k	61	41
8	4-CF3–Ph	H2	5k	65	35

^aReaction conditions: 4a (0.5 mmol), 6a (0.75 mmol), Ru₃(CO)₁₂ (5 mol %), and pinacolone (0.5 mL).

^bConversion based on GC analysis with respect to 4a (dodecane as internal standard).

^cni = not isolated.