Treatment of the siloxane monomer 2 with a mixture of molybdenum hexacarbonyl and 4-chlorophenol at 140 °C furnished the corresponding cyclotrimer 3 and the cyclotetramer 4.
Ring-closing alkyne metathesis with simple catalyst systems: an access to molecular triangles and rhomboids
N. G. Pschirer, W. Fu, R. D. Adams and U. H. F. Bunz, Chem. Commun., 2000, 87 DOI: 10.1039/A908638B
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