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An active in situ-generated Nb complex was used as a catalyst in the ring-closing metathesis reaction of N , N- diallyl- p -toluenesulfonamide to afford the corresponding 3-pyrroline derivative. The Nb complex was formed from NbCl 5 , trimethylsilyl chloride, Zn, and PhCHCl 2 in tetrahydrofuran. The Nb complex displayed high catalytic activity toward ring-closing metathesis reactions.

In Situ-Generated Niobium-Catalyzed Synthesis of 3-Pyrroline Derivatives via Ring-Closing Metathesis Reactions