Table 4. The impact of carbon monoxide partial pressure on the enantioselective Ir(i)-catalyzed PKR with 1,6-enynes containing various alkenyl substituents.

Entry	R	Solvent	CO : Ar (x v/v)	Time (h)	Yield (%)	ee (%)
1	Me	Toluene	100 : 0	24	30	88
2	"	Xylene	"	"	51	82
3	"	Toluene	20 : 80	72	86	93
4	Allyl	"	100 : 0	96	22	86
5	"	"	20 : 80	"	62	94