Next, we evaluated the catalytic performance of our Ir II catalyst and compared the results with its isostructural Ir I complex for a small family of terminal olefins. For convenience, we carried out these studies using the in situ prepared 3•BF4, as it can be easily obtained from a commercially available and affordable silver salt. The results are collected in Table and demonstrate in all cases that Ir II outperforms Ir I , exhibiting an increased in activity from 2 to 100 times. Monosubstituted terminal olefins are readily isomerized in good-to-quantitative yields, while increasing substitution requires longer reaction times to achieve completion. Allyl arenes are equally isomerized to their corresponding styrenes in good yields and terminal alkenes containing hydroxy groups do not deactivate the catalyst.