Pouchain, Laurent published the artcileQuaterthiophenes with Terminal Indeno[1,2-b]thiophene Units as p-Type Organic Semiconductors, Synthetic Route of 239075-02-6, the publication is Journal of Organic Chemistry (2009), 74(3), 1054-1064, database is CAplus and MEDLINE.
Quaterthiophenes 4T, Oct-4T, and Tol-4T based on a central 2,2′-bithiophene core α,ω-terminated with 4,4-unsubstituted and 4,4-disubstituted n-octyl or p-tolyl indeno[1,2-b]thiophene were synthesized by Stille or Miyaura-Suzuki couplings. Compound 4T was also synthesized by an alternative route involving a soluble precursor bearing solubilizing trimethylsilyl groups which were eliminated in the last step. The electronic properties of the compounds were analyzed by cyclic voltammetry, UV-visible absorption and fluorescence emission spectroscopy. Thermal evaporation of 4T and Oct-4T leads to crystalline thin films and UV-visible absorption and x-ray diffraction data for these films suggest that the mols. adopt a quasi-vertical orientation onto the substrate. Strong π-π intermol. interactions were observed for 4T but not for mols. Oct-4T due to the presence of n-octyl chains. Sublimed thin films of Tol-4T show an amorphous character. The characterization of field-effect transistors fabricated from these three materials gave a hole-mobility of 2.2 × 10-2 cm2 V-1 s-1 with an on/off ratio of 2.2 × 104 for 4T while no field-effect was observed for Oct-4T and Tol-4T.
Journal of Organic Chemistry published new progress about 239075-02-6. 239075-02-6 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Boronate Esters, name is 5,5′-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,2′-bithiophene, and the molecular formula is C20H28B2O4S2, Synthetic Route of 239075-02-6.
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