Z/E, Scheme 3A), which is in striking contrast to Ru2 proving-under the same conditions-2 in 52% yield and with much less stereoselection (Z/E = 58:42, compare in Scheme 1A). In particular, it was even possible to decrease Ru3 loading to as low as 0.5 mol% without reducing the yield of the musk product (78%) while maintaining excellent Z-selectivity (98:2 E/Z, Scheme 3A).