Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group
Abstract
This work was initiated by the increasing interest in BN/CC isosterism and by the long-lasting interest in the concepts of aromaticity and substituent effects. We have theoretically examined the aromaticity and stability of monosubstituted BN isosters of benzene, the three isomeric azaborines. The results provide insight into the effect of substitution on two basic molecular properties, which are influenced, here, by the substituent effects and by the B/N relationship in the ring. The results, along with other examples in the literature, also warn chemists that the general belief that aromaticity accounts for enhanced thermodynamic stability is not always true. The stability of cyclic, conjugated compounds depends on several effects, and only one of them is aromaticity. In addition, our calculations predict a switching of electronic properties of the NH 2 group from the usual p-electron donor to a π-electron acceptor when it is moved from the B/C atoms to the nitrogen atom in all isome...rs, or C6 in 1,3-azaborine. This is the result of the conformational change that places the N LP in the plane of the ring and the NH bonds in a favourable spatial position to act as acceptors of π-electron density.
Source:
Physical Chemistry Chemical Physics, 2019, 21, 18, 9465-9476Publisher:
- Royal Society of Chemistry
Funding / projects:
Note:
- Supplementary material: http://cherry.chem.bg.ac.rs/handle/123456789/3131
- Peer-reviewed manuscript: http://cherry.chem.bg.ac.rs/handle/123456789/3130
DOI: 10.1039/C9CP01011D
ISSN: 1463-9076
WoS: 000472922500049
Scopus: 2-s2.0-85065626673
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Hemijski fakultet / Faculty of ChemistryTY - JOUR AU - Baranac-Stojanović, Marija AU - Stojanović, Milovan PY - 2019 UR - https://cherry.chem.bg.ac.rs/handle/123456789/3128 AB - This work was initiated by the increasing interest in BN/CC isosterism and by the long-lasting interest in the concepts of aromaticity and substituent effects. We have theoretically examined the aromaticity and stability of monosubstituted BN isosters of benzene, the three isomeric azaborines. The results provide insight into the effect of substitution on two basic molecular properties, which are influenced, here, by the substituent effects and by the B/N relationship in the ring. The results, along with other examples in the literature, also warn chemists that the general belief that aromaticity accounts for enhanced thermodynamic stability is not always true. The stability of cyclic, conjugated compounds depends on several effects, and only one of them is aromaticity. In addition, our calculations predict a switching of electronic properties of the NH 2 group from the usual p-electron donor to a π-electron acceptor when it is moved from the B/C atoms to the nitrogen atom in all isomers, or C6 in 1,3-azaborine. This is the result of the conformational change that places the N LP in the plane of the ring and the NH bonds in a favourable spatial position to act as acceptors of π-electron density. PB - Royal Society of Chemistry T2 - Physical Chemistry Chemical Physics T1 - Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group VL - 21 IS - 18 SP - 9465 EP - 9476 DO - 10.1039/C9CP01011D ER -
@article{ author = "Baranac-Stojanović, Marija and Stojanović, Milovan", year = "2019", abstract = "This work was initiated by the increasing interest in BN/CC isosterism and by the long-lasting interest in the concepts of aromaticity and substituent effects. We have theoretically examined the aromaticity and stability of monosubstituted BN isosters of benzene, the three isomeric azaborines. The results provide insight into the effect of substitution on two basic molecular properties, which are influenced, here, by the substituent effects and by the B/N relationship in the ring. The results, along with other examples in the literature, also warn chemists that the general belief that aromaticity accounts for enhanced thermodynamic stability is not always true. The stability of cyclic, conjugated compounds depends on several effects, and only one of them is aromaticity. In addition, our calculations predict a switching of electronic properties of the NH 2 group from the usual p-electron donor to a π-electron acceptor when it is moved from the B/C atoms to the nitrogen atom in all isomers, or C6 in 1,3-azaborine. This is the result of the conformational change that places the N LP in the plane of the ring and the NH bonds in a favourable spatial position to act as acceptors of π-electron density.", publisher = "Royal Society of Chemistry", journal = "Physical Chemistry Chemical Physics", title = "Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group", volume = "21", number = "18", pages = "9465-9476", doi = "10.1039/C9CP01011D" }
Baranac-Stojanović, M.,& Stojanović, M.. (2019). Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group. in Physical Chemistry Chemical Physics Royal Society of Chemistry., 21(18), 9465-9476. https://doi.org/10.1039/C9CP01011D
Baranac-Stojanović M, Stojanović M. Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group. in Physical Chemistry Chemical Physics. 2019;21(18):9465-9476. doi:10.1039/C9CP01011D .
Baranac-Stojanović, Marija, Stojanović, Milovan, "Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH2 group" in Physical Chemistry Chemical Physics, 21, no. 18 (2019):9465-9476, https://doi.org/10.1039/C9CP01011D . .