Goldenberg, C. et al. published their research in Bulletin des Societes Chimiques Belges in 1966 | CAS: 1646-27-1

Methyl benzofuran-2-carboxylate (cas: 1646-27-1) belongs to benzofurans derivatives.Benzofuran is one of the most significant oxygen-containing heterocycles consisting of fused benzene and furan ring, which are widely presented in various naturally occurring and synthetically active compounds. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Electric Literature of C10H8O3

Benzofuran derivatives. XVI. Infrared spectra of coumarilic acid esters was written by Goldenberg, C.;Binon, F.. And the article was included in Bulletin des Societes Chimiques Belges in 1966.Electric Literature of C10H8O3 This article mentions the following:

The ir spectra of coumarilic acid esters in CS2 showed 2 peaks in the carbonyl stretching region. Exptl. it was proved that this splitting was not due to a Fermi resonance or to the existence of dimers. The splitting was ascribed to the link XCCOOR(X = O or N) in a cyclic or acyclic structure, in which 2 rotational isomers were present in equilibrium In the experiment, the researchers used many compounds, for example, Methyl benzofuran-2-carboxylate (cas: 1646-27-1Electric Literature of C10H8O3).

Methyl benzofuran-2-carboxylate (cas: 1646-27-1) belongs to benzofurans derivatives.Benzofuran is one of the most significant oxygen-containing heterocycles consisting of fused benzene and furan ring, which are widely presented in various naturally occurring and synthetically active compounds. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Electric Literature of C10H8O3

Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem