 Template-directed ring-closing metathesis and ring-opening metathesis polymerization of functionalized dienes by Robert H. Grubbs and others

US6080826A, original inventors Robert H. Grubbs, Michael J. Marsella and Heather D. Maynard. Table 1 reports template effects on cyclic-polyether formation; the discussion explicitly identifies a 14-membered ring. Only the nonbiological chemical evidence is used here.