After dropping 1,4-dichloro-2-butyne into the solution of carbazole sodium (NaCz) in THF under nitrogen atmosphere at 65 ℃ for 9 h, trans-N-3-yne-butenylcarbazole was synthesized and recrystallized in benzene and petroleum ether. It was initiated and oligomerized by heat treatment, BPO, BF₃, FeCl₃, P₂O₅, UV or visual light. The products were characterized by elemental analysis, IR, MS, UV and ¹H NMR spectra. IR and ¹H NMR spectra of the oligomers showed the absence of bands ν at 3278 (HC≡), 2099 cm^－1 (C≡C) and band  at 2.8～3.0 (HC≡). The oligomer molecular weight determined by VPO method was between 8.3×10² and 1.9×10³ (n≈4～9).

Key words: synthesis, structure, oligomerization, trans-N-3-yne-butenylcarbazole