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Lee R, Bashrum B, Cagle EC, Walters J, Massey J, Zanghi M, Birchfield C, French D, Joy J, Dos Passos Gomes G, Wiget PA. Electronic Donation or Steric Contraction: A Spectroscopic and Structural Analysis of Medium-Sized Constrained Rings for Potential Long-Range Hyperconjugation. J Org Chem 2019; 84:9897-9906. [PMID: 31340636 DOI: 10.1021/acs.joc.9b00979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we report the 1JCH analyses, natural bond orbital analyses, and X-ray crystal structures of a number of C, O, and N constrained tricyclic cycles. These experiments provide access into the nature of the apparent Perlin effect previously reported in constrained tricyclic cycles, as well as evidence suggesting both steric contraction and long-range hyperconjugation account for the observed 1JCH perturbations. We report a true Perlin effect of 10.9 Hz in an azocane and large steric effect resulting in Δ1JC-H = 10.9 Hz in a cyclooctane.
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Affiliation(s)
- Robert Lee
- Department of Chemistry and Biochemistry , Samford University , 800 Lakeshore Blvd. , Birmingham , Alabama 35229 , United States
| | - Bryan Bashrum
- Department of Chemistry and Biochemistry , Samford University , 800 Lakeshore Blvd. , Birmingham , Alabama 35229 , United States
| | - Ethan C Cagle
- Department of Chemistry , The University of Alabama at Birmingham , Birmingham , Alabama 35205 , United States
| | - Jillian Walters
- Department of Chemistry and Biochemistry , Samford University , 800 Lakeshore Blvd. , Birmingham , Alabama 35229 , United States
| | - Jake Massey
- Department of Biological and Environmental Sciences , Samford University , Birmingham , Alabama 35229 , United States
| | - Monica Zanghi
- Department of Biological and Environmental Sciences , Samford University , Birmingham , Alabama 35229 , United States
| | - Carolyn Birchfield
- Department of Biological and Environmental Sciences , Samford University , Birmingham , Alabama 35229 , United States
| | - David French
- Department of Chemistry , The University of Alabama at Birmingham , Birmingham , Alabama 35205 , United States
| | - Jessica Joy
- Department of Biological and Environmental Sciences , Samford University , Birmingham , Alabama 35229 , United States
| | - Gabriel Dos Passos Gomes
- Department of Chemistry & Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Paul A Wiget
- Department of Chemistry and Biochemistry , Samford University , 800 Lakeshore Blvd. , Birmingham , Alabama 35229 , United States
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Salome KS, Tormena CF. Revisiting the Long-Range Perlin Effect in a Conformationally Constrained Oxocane. J Org Chem 2018; 83:10501-10504. [DOI: 10.1021/acs.joc.8b00935] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kahlil S. Salome
- Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Cláudio F. Tormena
- Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
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