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BIBTEX RIS

The Dual-Site Alternating Cyclocopolymerization of 1,3-Butadiene with Ethylene

2003; American Chemical Society; Volume: 125; Issue: 30 Linguagem: Inglês

10.1021/ja034603x

ISSN

1943-2984

Autores

Tong Neo Choo, Robert M. Waymouth,

Tópico(s)

Catalytic Alkyne Reactions

Resumo

The copolymerization of ethylene with 1,3-butadiene was studied with the series of ansa-metallocenes Me2Si(Cp)(9-Flu)ZrCl2 (1), Me2Si(1-Ind)(9-Flu)ZrCl2 (2), and Me2Si(9-Flu)2ZrCl2 (3) with methylaluminoxane (MAO) as cocatalyst. The catalyst 2/MAO yields a cyclocopolymer composed of two ethylene monomer units for every one butadiene in a novel periodic architecture of 1,2-enchained cyclopentane units separated by three methylenes. The high butadiene content in the copolymer and the high selectivity for alternating cyclocopolymerization to form methylene-1,2-cyclopentane units implicate a dual-site mechanism where butadiene and ethylene are enchained at different coordination sites.

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