Alternating copolymerization of carbon monoxide with aziridine was realized, which serves as a prototype of a novel route for synthesis of poly-b-peptides.a In 100 mL THF at 80 °C. b Amine defects estimated by 1 H NMR. c Determined by GPC in 1,1,1,3,3,3-hexafluoropropan-2-ol with 0.01 M sodium triflate, light scattering-viscometry-refractive index triple detector. d Aziridine was added in portions.Scheme 1 Working model for alternating copolymerization of CO with aziridine (L = PPh 3 ).

No abstract

No abstract

No abstract

Synthesis, structural characterization, and preliminary reactivity studies of the title compounds are reported. The ethylene polymerization and diene cyclization activities that these complexes have shown are unprecedented for neutral molecules of the type X 3 MR (X ) amide, alkoxide, or siloxide; M ) group 4 metal; R ) alkyl or hydride).Group 4 d 0 organometallic molecules of the type A have been studied since the 1970s.