A soluble precursor of hexacene is prepared from a cycloaddition of hexacene and diethyl ketomalonate in high yield. It can be used to make hexacene thin-films through spin-coating for the fabrication of organic field effect transistors.

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Heptacene (1) has been produced via a monoketone precursor, 2, which was prepared from 1,2,4,5tetrabromobenzene in nine steps in a total yield of 10 %. Compound 2 was converted to 1 quantitatively by heating at 202°C. Heptacene exhibited high thermal stability in the solid state without any observable change over two months. To investigate the potential value of 1 as a material for p-type organic field-effect transistors (OFETs), top-contact OFET devices were fabricated by vacuum deposition of 1 onto a hexamethyldisilazane (HMDS)/SiO 2 /Si substrate. The best hole mobility performance was 2.2 cm 2 V À 1 s À 1 . This is the first report of stable heptacene being used in an effective device and examined for its charge carrier properties.