1. Estimate of Hyperconjugation Strength in Alkylaromatics and Unsaturated Hydrocarbons Derived from Refractometric Data
- Author
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Almarza-Torres Marina, Hembe Mukaya Elie, A. Zaitsev Boris, D. Bertol Charise, Stankevičiūtė Simona, Yuan Ding, Ebrahimi Masoumeh, Arikoglu Tugba, C.F. Guerra Kielli, Glienke Chirlei, Tonial Fabiana, M. Frey Kathleen, Jian-He Du, Sanabria-Cabrera Judith, A.G. Figueiredo Josiane, Xing-Wang Li, Bolhassani Manzar, Isazadeh Alireza, Rodríguez-Nicolás Antonio, Shahpouri Javad, Yangkou Mbianda Xavier, Guvenir Hakan, H.L.N. Sales Maia Beatriz, R. Mohamadi Ali, Jiang-Feng Sun, Soleyman-Nejad Morteza, Isabel Lucena M., Karimi Hadi, Medina-Cáliz Inmaculada, Heidari Masoud, Karimi Zahra, Heidari Mansour, Dibek Misirlioglu Emine, Vezir Emine, H. Taskhiri Mohammad, Ahangari Roghayyeh, and J. Andrade Raúl
- Subjects
020401 chemical engineering ,Computational chemistry ,Chemistry ,Organic Chemistry ,02 engineering and technology ,0204 chemical engineering ,010402 general chemistry ,Hyperconjugation ,01 natural sciences ,0104 chemical sciences - Abstract
A retrospective view of exaltation of refraction observed for many unsaturated and aromatic compounds demonstrates that this physical phenomenon is undeservedly considered only as a qualitative measure of conjugation. This mini-review discusses numerous papers by the author that have been published earlier in inaccessible periodicals and collections of scientific papers. Using a great number of illustrations, the author shows that this parameter can be successfully used for quantitative estimate of resonance effects in organic and polymer chemistry. The methods for derivation of strictly additive atomic and group refraction constants are described; these constants were subsequently used as a tool that allowed quantitative estimation of resonance effects in mono-, di-, tri- and polyalkylbenzenes, alkylnaphthalenes, some alkyl derivatives of unsaturated hydrocarbons. These effects cause strictly fixed increase in refraction of carbon atoms in different structural modifications (graphene, fullerene, diamond) and in polycyclic aromatic hydrocarbons. The relevant results regarding quantitative estimation of degree of steric inhibition of resonance in sterically hindered ortho-dialkylbenzenes, 1,2,3- trialkyl-, 1,2,3,4-tetraalkyl-, and 1,2,3,4,5-polyalkylbenzenes accumulated by the author are summarized.
- Published
- 2020