Abstract
Local and global steric strains are studied by spectroscopy and crystallography and by theoretical models. Double-bond and heteroatom pair contributions are investigated with regard to cyclic and acyclic hydrocarbons. Theoretical investigation of steric strain release (SSR) through conformational dodging and geometric deformation from molecular standard values reveals details about congested structures which are not accessible through experimentation. Qualitative rules concerning access to blocked sites—distorted gem-6 structures, bi-sected double bonds—and the control of anomeric structures are understood through studying SSR processes based on the interplay of the Pitzer or related strain and of the hyperconjugative effect, the ring or backbone strain and various through-space interactions (TSI). The empirical and semi-empirical computational modelization of strain release processes leading to the control of complex rotations disclose surprising flexibility in hyper-crowded molecules.
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Dubois, JE., Cossé-Barbi, A. Strain release in conformational and geometric adaptation of moderately and highly congested systems: Interplay of small structural effects. Struct Chem 2, 89–105 (1991). https://doi.org/10.1007/BF00676620
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DOI: https://doi.org/10.1007/BF00676620