C–H Functionalization Polycondensation of Chlorothiophenes in the Presence of Nickel Catalyst with Stoichiometric or Catalytically Generated Magnesium Amide
2011; American Chemical Society; Volume: 133; Issue: 25 Linguagem: Inglês
10.1021/ja2033525
ISSN1943-2984
AutoresShunsuke Tamba, Keisuke Shono, Atsushi Sugie, Atsunori Mori,
Tópico(s)N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
ResumoPolymerization of 2-chloro-3-substituted thiophenes proceeded with a stoichiometric amount of magnesium amide, TMPMgCl·LiCl, or a combination of a Grignard reagent and a catalytic amount of secondary amine in the presence of a nickel catalyst. Although the nickel-catalyzed polymerization with NiCl(2)dppe, which exhibited high catalytic activity in the reaction of bromothiophenes, was less effective, use of a nickel catalyst bearing N-heterocyclic carbene as a ligand was found to induce polymerization with controlled molecular weight and molecular weight distribution.
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