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Article: Conformational behaviour of medium-sized rings. Part 4. Heterocyclic analogues of 7,8,13,14-tetrahydrobenzo[6,7]cyclonona[1,2,3-de]- naphthalene and 7,8,15,16-tetrahydrocyclodeca[l,2,3-de: 6,7,8-d'e']dinaphthalene
Title | Conformational behaviour of medium-sized rings. Part 4. Heterocyclic analogues of 7,8,13,14-tetrahydrobenzo[6,7]cyclonona[1,2,3-de]- naphthalene and 7,8,15,16-tetrahydrocyclodeca[l,2,3-de: 6,7,8-d'e']dinaphthalene |
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Authors | |
Issue Date | 1978 |
Citation | Journal of the Chemical Society, Perkin Transactions 1, 1978, p. 1385-1392 How to Cite? |
Abstract | The temperature dependences of the 1H n.m.r. spectra of 8N.15H-dinaphtho[1,8-bc: 1',8'-gh] [1,5]dioxecin (4) and of heterocyclic analogues (2a, b, e, and f) of 7.8.1 3.1 4-tetrahydrobenzo[6,7]cyclonona[l,2,3-de]naphthalene have been interpreted in terms of ring inversion between enantiomeric twist-boat conformations. The temperature dependences of the 1H n.m.r. spectra of the dithionins (2c and d) have been interpreted in terms of interconversions between chair and twist-boat conformations. A comparison of activation parameters shows that when periannelated naphthalene rings replace ortho-annelated benzene rings in '6.8.6' systems (1). chair-like conformations are destablised relative to boat-like conformations and the energy barriers to ring inversions involving pseudorotational processes are considerably higher. © 1978, Royal Society of Chemistry. |
Persistent Identifier | http://hdl.handle.net/10722/332810 |
ISSN | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Brickwood, David J. | - |
dc.contributor.author | Ollis, W. David | - |
dc.contributor.author | Stoddart, J. Fraser | - |
dc.date.accessioned | 2023-10-06T05:14:27Z | - |
dc.date.available | 2023-10-06T05:14:27Z | - |
dc.date.issued | 1978 | - |
dc.identifier.citation | Journal of the Chemical Society, Perkin Transactions 1, 1978, p. 1385-1392 | - |
dc.identifier.issn | 1470-4358 | - |
dc.identifier.uri | http://hdl.handle.net/10722/332810 | - |
dc.description.abstract | The temperature dependences of the 1H n.m.r. spectra of 8N.15H-dinaphtho[1,8-bc: 1',8'-gh] [1,5]dioxecin (4) and of heterocyclic analogues (2a, b, e, and f) of 7.8.1 3.1 4-tetrahydrobenzo[6,7]cyclonona[l,2,3-de]naphthalene have been interpreted in terms of ring inversion between enantiomeric twist-boat conformations. The temperature dependences of the 1H n.m.r. spectra of the dithionins (2c and d) have been interpreted in terms of interconversions between chair and twist-boat conformations. A comparison of activation parameters shows that when periannelated naphthalene rings replace ortho-annelated benzene rings in '6.8.6' systems (1). chair-like conformations are destablised relative to boat-like conformations and the energy barriers to ring inversions involving pseudorotational processes are considerably higher. © 1978, Royal Society of Chemistry. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of the Chemical Society, Perkin Transactions 1 | - |
dc.title | Conformational behaviour of medium-sized rings. Part 4. Heterocyclic analogues of 7,8,13,14-tetrahydrobenzo[6,7]cyclonona[1,2,3-de]- naphthalene and 7,8,15,16-tetrahydrocyclodeca[l,2,3-de: 6,7,8-d'e']dinaphthalene | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1039/P19780001385 | - |
dc.identifier.scopus | eid_2-s2.0-37049113045 | - |
dc.identifier.spage | 1385 | - |
dc.identifier.epage | 1392 | - |
dc.identifier.isi | WOS:A1978FY45300024 | - |