Perception of Rings

Fujita, S. (1988) Logical perception of ring-opening, ring-closure, and rearrangement reactions based on imaginary transition structures, selection of the essential set of essential rings (ESER).J. Chem. Inf. Comput. Sci., 28, 1-9. 

The aim of this paper is to change your perception of rings As basic justification for such an attempt I commend to you Mike Lynch s keynote address to the last conference in which he looked forward to the further development of graph theory to enable a sufficiently abstract way [to talk] about characteristics of ring systems , and drew attention to Lavoisier s observation that to change a science, one needs to change the language of the science . 

Multiple bonds, internal rings, and other molecular substructures or subgraphs (see Figure 4.10a) are recognized through a circular inspection method. A circle of inspection centered on each detected atom is considered (see Figure 4.10b). Unknown border pixels found in this way are kept and used as the initial point for a new counterclockwise contour search, and the perception of new vertices and probable new atoms is carried out as described earlier. 

Downs, G.M., Gillet, V.J., Holliday, J.D. and Lynch, M. F. (1989b) Theoretical aspects of ring perception and development of the extended set of smallest rings concept./. Chem. Inf. Comput. Sci., 29, 187-206. 

Gasteiger, J. and Jochum, C. (1979) An algorithm for the perception of synthetically important rings. 

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