Unexpectedly high reactivity is observed for a bis(cyclic alkylaminocarbene) ruthenium complex, which allows the formation of terminal and internal C−C double bonds at very low catalyst loadings. In their Communication on
page 981 ff., K. Skowerski et al. show that turnover numbers exceeding 3×10
5 were achieved in the self-metathesis of 1-decene. Classical Grubbs and Hoveyda–Grubbs complexes were less selective and several times less efficient in this transformation.