A cobalt carbonyl cluster, methylidynetricobalt nonacarbonyl, catalyzed inter- and intramolecular cyclotrimerization of alkynes producing substituted benzene derivatives in good to excellent yields.
2002 ring closure reactions ring closure reactions O 0130
-061Methylidynetricobalt Nonacarbonyl Catalyzed Cyclotrimerization of Alkynes.-A cobalt carbonyl cluster catalyzes the inter-and intramolecular cyclotrimerization of alkynes producing substituted benzenes in good to high yields. Interestingly, as shown for compound (VIId), the intramolecular cyclotrimerization is significant faster than an alternative intramolecular Pauson-Khand reaction. -(SUGIHARA, TAKUMICHI; WAKABAYASHI,
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