The author of 《Synthesis of Benzo[1,2-b:4,5-b’]dithiophene and Benzocondensed Thiaheterocycles》 were Baldoli, Clara; Cauteruccio, Silvia; Licandro, Emanuela. And the article was published in ChemistrySelect in 2019. Electric Literature of C7H8O2S The author mentioned the following in the article:
A two-step synthesis of benzo[1,2-b:4,5-b’]dithiophene (BDT) was carried out starting from 3-thiophene carbaldehyde as the sole thiophene precursor. This method involved the selective lithiation of the 2-position of 3-thiophenecarbaldehyde ethylene acetal, followed by the condensation with 3-thiophenecarbaldehyde and subsequent dehydrative cycloaromatization of the dithienylmethanol intermediate to give BDT. This synthetic pathway was extended to other thiophene benzocondensed heterocycles, e.g., I. In the experimental materials used by the author, we found 2-(Thiophen-3-yl)-1,3-dioxolane(cas: 13250-82-3Electric Literature of C7H8O2S)
2-(Thiophen-3-yl)-1,3-dioxolane(cas: 13250-82-3) is one of dioxolane. 1,3-Dioxolane derivatives are recognized as important motifs for the construction of numerous pharmacologically active molecules as antiviral, antifungal, anti-HIV, and adrenoreceptor antagonists.Electric Literature of C7H8O2S
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem