Table 1. Screening of Ru, Mo, and W Complexes^a.

^aReactions were performed under N₂ atmosphere.

^bConversion (total consumption of 1) and Z:E ratios (±2%) were determined by analysis of ¹H NMR spectra of unpurified mixtures.

^cProduct mixture contained ca. 50% of the dimeric macrocycle. See the Supporting Information (SI) for details. Mes = 2,4,6-(Me)₃C₆H₂; na = not applicable; nd = not determined.