The infrared vibration bands of CH in solid CHCl3 and CDCl3 was written by Denariez, Marguerite Marie. And the article was included in Journal de Chimie Physique et de Physico-Chimie Biologique in 1965.Safety of Methyl benzofuran-2-carboxylate This article mentions the following:
Disagreement in previous reports on the C-H band in CHCl3 (I) (Lisitsa and Tsyashchenko, CA 55, 15118e; Maklakov and Nikitin, CA 60, 7589c; Ito, CA 61, 9068b) are herein ascribed to two crystalline forms of solid I. By using the cryostat of Becker & Pimental (CA 50, 15244a), evaporation onto KBr or CsBr plates at 80 or 150°K. gives 2 different spectra; warming the 80°K. sample causes the spectrum to shift while the reverse (cooling) has no effect. The spectrum of the higher form is related to that in solution and is regarded as that of the stable form. CDCl3 behaves like I. The change is due to increased degeneracy of vibration levels enhanced by resonance between neighboring mols. in the solid. In the experiment, the researchers used many compounds, for example, Methyl benzofuran-2-carboxylate (cas: 1646-27-1Safety of Methyl benzofuran-2-carboxylate).
Methyl benzofuran-2-carboxylate (cas: 1646-27-1) belongs to benzofurans derivatives. Benzofuran derivatives are one of the most important oxygen-containing heterocycles. Benzofurans are stable towards alkali and readily polymerize on treatment with sulfuric acid, due to which they are useful for the preparation of low cost chemically relatively inert resins.Safety of Methyl benzofuran-2-carboxylate
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem