Nonclassical carbon: From theory to experiment

Nonclassical organic compounds are defined as compounds comprising in their molecular or ionic structure nontetrahedral (planar, pyramidal, semiplanar, or inverted) tetra-or/and hypercoordinate carbon centers. The evolution of concepts was considered and accumulated theoretical and experimental data concerning the structure and dynamic transformations of nonclassical organic compounds were systematized. Computational analysis based on the methods and computational potential of modern quantum chemistry has presently gained a high predictive power and serves as a potent source of information on structural organization of nonclassical compounds.