Bianco, Armandodoriano; Guiso, Marcella; Mazzei, Raffaele Antonio; Nano, Giuseppe published an article on January 31 ,1997. The article was titled 《New insights on the reaction of benzofurans with aromatic aldehydes. Synthesis of new triphenylmethane-type dyes》, and you may find the article in Gazzetta Chimica Italiana.Formula: C12H12O4 The information in the text is summarized as follows:
New mols. with a triphenylmethane-type structure have been synthesized based on the structure of colored compounds obtained from natural substrates. Satisfactory yields were obtained from benzofuran derivatives as starting material, which have been condensed in methanol with aromatic aldehydes in the presence of catalytic amounts of mineral acids. Several of the new compounds behave as pH indicators. The condensation products, obtained from suitably functionalized starting products, can be easily oxidized giving rise to new triphenylmethane-type dyes, such as I. In the experiment, the researchers used many compounds, for example, Ethyl 6-methoxybenzofuran-2-carboxylate(cas: 50551-57-0Formula: C12H12O4)
Ethyl 6-methoxybenzofuran-2-carboxylate(cas: 50551-57-0) belongs to benzofurans.Formula: C12H12O4Benzofurans containing one furan ring that have been implicated as psychoactive recreational drugs include 6-(2-aminopropyl)benzofuran (6-APB), 5-(2-aminopropyl)benzofuran (5-APB), 5-(2-ethylaminopropyl)benzofuran (5-EAPB), and 5-methylaminopropylbenzofuran (5-MAPB).
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem