Ng. Pschirer et al., Ring-closing alkyne metathesis with simple catalyst systems: an access to molecular triangles and rhomboids, CHEM COMMUN, (1), 2000, pp. 87-88
Treatment of the siloxane monomer 2 with a mixture of molybdenum hexacarbon
yl and 4-chlorophenol at 140 degrees C furnished the corresponding cyclotri
mer 3 and the cyclotetramer 4.