Anionic sigmatropic-electrocyclic-chugaev cascades: Accessing 12-aryl-5-(methylthiocarbonylthio)tetracenes and a related anthra[2,3-b]thiophene

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Abstract

1,4-Diols resulting from the double addition of ArCCLi (Ar = Ph, substituted phenyl, 2-thienyl) to ortho-C 6 H 4 (CHO) 2 undergo cascades to tetracenes on simple admixture of LiHDMS, CS 2 and MeI. Acene formation proceeds by [3,3]-sigmatropic rearrangement of xanthate anions followed by 6π electrocyclisations. The reactions are terminated by E2 or anionic Chugaev-type eliminations. Structural packing motifs and electronic properties are reported for the tetracenes.

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Burroughs, L., Ritchie, J., Ngwenya, M., Khan, D., Lewis, W., & Woodward, S. (2015). Anionic sigmatropic-electrocyclic-chugaev cascades: Accessing 12-aryl-5-(methylthiocarbonylthio)tetracenes and a related anthra[2,3-b]thiophene. Beilstein Journal of Organic Chemistry, 11, 273–279. https://doi.org/10.3762/bjoc.11.31

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