A cobalt carbonyl cluster, methylidynetricobalt nonacarbonyl, catalyzed inter- and intramolecular cyclotrimerization of alkynes producing substituted benzene derivatives in good to excellent yields.
Easily prepared and air-stable methylidynetricobalt nonacarbonyl could be used as a catalyst for the intramolecular [2 + 2 + 1]-cocyclization of diynes and carbon monoxide producing cyclopentadienones.
An Efficient Chemical Fixation of Nitric Oxide: Convenient and Practical Synthesis of 1,2,3-Oxadiazole 3-Oxides. -Nitric oxide reacts efficiently with alkynyllithium at low temperature producing 1,2,3-oxadiazole 3-oxides, such as (II) and (IV). -(SUGIHARA*, T.; KUWAHARA, K.; WAKABAYASHI, A.; TAKAO, H.; IMAGAWA, H.; NISHIZAWA, M.; Chem. Commun. (Cambridge) 2004, 2, 216-217; Fac. Pharm. Sci., Tokushima Bunri Univ., Yamashiro, Tokushima 770, Japan; Eng.) -M. Paetzel 17-124
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