Highly Active Metathesis Catalysts Generated In Situ from Inexpensive and Air-Stable Precursors J.L. acknowledges the National Institute of Health for a postdoctoral fellowship. We thank Christopher W. Bielawski for helpful discussions.

Highly Active Metathesis Catalysts Generated In Situ from Inexpensive and Air-Stable Precursors J.L. acknowledges the National Institute of Health for a postdoctoral fellowship. We thank Christopher W. Bielawski for helpful discussions.