Boykin, David W.; Baumstark, Alfons L.; Kayser, Margaret M.; Soucy, Chantal M. published an article in Canadian Journal of Chemistry. The title of the article was 《Oxygen-17 nuclear magnetic resonance spectroscopic study of substituted phthalic anhydrides and phthalides》.Computed Properties of C8H5IO2 The author mentioned the following in the article:
17O chem. shift data (natural abundance) for 3-substituted phthalic anhydrides and 4- and 7-substituted phthalides in acetonitrile at 75° are reported. Steric interactions of substituents ortho to the carbonyl groups result in deshielding effects (9-22 ppm) relative to parent compounds regardless of the electronic character of the substituents. Factors contributing to the deshielding effects are discussed. The relationship between 17O chem. shifts and regiochem. of the phthalic anhydrides is discussed. In the part of experimental materials, we found many familiar compounds, such as 7-Iodoisobenzofuran-1(3H)-one(cas: 105694-46-0Computed Properties of C8H5IO2)
7-Iodoisobenzofuran-1(3H)-one(cas: 105694-46-0) belongs to benzofurans.Computed Properties of C8H5IO2Benzofurans 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