An oligometallic template effect was observed on the cis/trans selectivity of a 32-membered macrocyclic tetraoxime in ring-closing olefin metathesis of an acyclic diallyl derivative H4L; the metathesis of heterotrinuclear complex LZn2M (M = Ca2+, La3+) afforded the cis isomer, whereas uncomplexed H4L gave the trans isomer.
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