Intramolecular cyclotrimerization of triynes catalyzed by N-heterocyclic carbene-CoCl2/Zn or -FeCl3/Zn.
[reaction: see text] Triynes 1 could effectively be cyclotrimerized to annulated benzenes 2 by treatment with a catalytic amount of zinc powder, N-heterocyclic carbene, and CoCl(2) or FeCl(3).
Department of Applied Chemistry, Kanagawa University, Kanagawa-ku, Yokohama, Japan.
Naoko
N
Saino
Daisuke
D
Kogure
Sentaro
S
Okamoto