Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Review, Chemical Communications (Cambridge, United Kingdom) called Magnetic shielding paints an accurate and easy-to-visualize portrait of aromaticity, Author is Karadakov, Peter B.; VanVeller, Brett, which mentions a compound: 288-42-6, SMILESS is O1C=NC=C1, Molecular C3H3NO, Product Details of 288-42-6.
Chemists are trained to recognize aromaticity semi-intuitively, using pictures of resonance structures and Frost-Musulin diagrams, or simple electron-counting rules such as Huckel’s 4n + 2/4n rule. To quantify aromaticity one can use various aromaticity indexes, each of which is a number reflecting some exptl. measured or calculated mol. property, or some feature of the mol. wavefunction, which often has no visual interpretation or may not have direct chem. relevance. We show that computed isotropic magnetic shielding isosurfaces and contour plots provide a feature-rich picture of aromaticity and chem. bonding which is both quant. and easy-to-visualize and interpret. These isosurfaces and contour plots make good chem. sense as at at. positions they are pinned to the nuclear shieldings which are exptl. measurable through chem. shifts. As examples we discuss the archetypal aromatic and antiarom. mols. of benzene and square cyclobutadiene, followed by modern visual interpretations of Clar’s aromatic sextet theory, the aromaticity of corannulene and heteroaromaticity.
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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem