|
1
|
Berlicka A, Foryś-Martowłos P, Hassa K, Białek MJ, Ślepokura K, Latos-Grażyński L. 21-Carba-23-oxaporphyrinoids and 21-oxo-21-carba-23-oxaporphyrinoids: macrocyclic π-conjugation involving the carbonyl moiety. Org Chem Front 2022. [DOI: 10.1039/d2qo00960a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aromaticity of 21-oxo-21-carba-23-oxachlorin resulted from a predominant dipolar contributor. Nonaromaticity of 21-oxo-21-carba-23-oxaporphyrin reflects a participation of canonical aromatic and antiaromatic forms engaged in a peculiar “tug of war”.
Collapse
Affiliation(s)
- Anna Berlicka
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | | | - Karolina Hassa
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Michał J. Białek
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Katarzyna Ślepokura
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | | |
Collapse
|
|
2
|
Valadbeigi Y. Effects of intramolecular hydrogen bond and electron delocalization on the basicity of proton sponges and superbases with benzene, pyridine, pyrazine and pyrimidine scaffolds. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112947] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
|
3
|
Valadbeigi Y. Proton sponges and superbases with nitrogen, phosphorus, arsenic, oxygen, sulfur, and selenium as proton acceptor sites. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
|
4
|
Palmer MH, Hoffmann SV, Jones NC, Coreno M, de Simone M, Grazioli C, Aitken RA. The vacuum ultraviolet spectrum of cyclohepta-1, 3, 5-triene: Analysis of the singlet and triplet excited states by ab initio and density functional methods. J Chem Phys 2020; 153:054301. [DOI: 10.1063/5.0011088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Michael H. Palmer
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, Scotland, United Kingdom
| | - Søren Vrønning Hoffmann
- ISA, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
| | - Nykola C. Jones
- ISA, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
| | - Marcello Coreno
- ISM-CNR, Istituto di Struttura della Materia, LD2 Unit, 34149 Trieste, Italy
| | - Monica de Simone
- IOM-CNR, Istituto Officina dei Materiali, Elettra-Sincrotrone, I-34149 Basovizza, Trieste S.S., Trieste, Italy
| | - Cesare Grazioli
- IOM-CNR, Istituto Officina dei Materiali, Elettra-Sincrotrone, I-34149 Basovizza, Trieste S.S., Trieste, Italy
| | - R. Alan Aitken
- School of Chemistry, University of St Andrews, North Haugh, St Andrews Fife KY16 9ST, Scotland, United Kingdom
| |
Collapse
|
|
5
|
Saeidian H, Mirjafary Z. Engineering non-ionic carbon super- and hyperbases by a computational DFT approach: substituted allenes have unprecedented cation affinities. NEW J CHEM 2020. [DOI: 10.1039/d0nj02207a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
DFT calculations reveal that allenes substituted by a cyclopropene or a methylenecyclopropene group, offer suitable scaffolds for tailoring powerful carbon bases. The protonation at C(sp) site provide superbases with PAs = 879–1218 kJ mol−1.
Collapse
Affiliation(s)
- Hamid Saeidian
- Department of Science
- Payame Noor University (PNU)
- Tehran
- Iran
| | - Zohreh Mirjafary
- Department of Chemistry
- Science and Research Branch
- Islamic Azad University
- Tehran
- Iran
| |
Collapse
|