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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Thiophene-Fused π-Systems from Diarylacetylenes and Elemental Sulfur.
Journal of the American Chemical Society 2016 August 18
A simple yet effective method for the formation of thiophene-fused π-systems is reported. When arylethynyl-substituted polycyclic arenes were heated in DMF in the presence of elemental sulfur, the corresponding thiophene-fused polycyclic arenes were obtained via cleavage of the ortho-C-H bond. Thus, arylethynylated naphthalenes, fluoranthenes, pyrenes, corannulenes, chrysenes, and benzo[c]naphtho[2,1-p]chrysenes were effectively converted into the corresponding thiophene-fused π-systems. Apart from polycyclic hydrocarbons, thiophene derivatives are also susceptible to this reaction. The practical utility of this reaction is demonstrated by preparations on the decagram scale, one-pot two-step reaction sequences, and multiple thiophene annulations.
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