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Terthienyl carbene complexes
Dissertation (MSc (Chemistry))--University of Pretoria, 2001.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613719919329280 |
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| access_status_str | Open Access |
| author2 | Lotz, Simon |
| author_browse | Lotz, Simon |
| author_facet | Lotz, Simon |
| collection | Thesis |
| dc_rights_str_mv | © 2001 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Chemistry))--University of Pretoria, 2001. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/27651 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:37.576Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/27651 Terthienyl carbene complexes Lotz, Simon upetd@up.ac.za Moeng, Mmushi Moses Carbenes methylene compounds terthienyl UCTD Dissertation (MSc (Chemistry))--University of Pretoria, 2001. Terthienyl (HTTTH) forms part of the family of conjugated 5-membered heterocycles and although many novel conversions of thiophenes and their derivatives have been recorded, the coordination chemistry of terthienyl has been neglected. Dinuclear biscarbene complexes [(CO)5MC(OEt)TTTC(OEt)M(CO) 5l, and monocarbene complexes [M(CO) 5{C(OEt)TTTH}] of the transition metals Cr, Mo and W with terthienyl spacer units were prepared. The reactivity of these complexes with ammonia, their relative stability and their structural features were investigated. The study focuses on electron delocalization of the conjugated TTT moiety and the role of the TIT substituent in stabilizing the electrophilic carbene carbon. Terthienyl substrates are readily mono and dimetallated and the classical Fischer method for the synthesis of carbene complexes was used. Complexes were fully characterized and molecular structures were determined. A single crystal structure determination of the tungsten biscarbene complex indicated a planar configuration of the thienyl rings and partial de localization through the conjugated ring system. Chemistry unrestricted 2013-09-07T11:56:11Z 2006-02-13 2013-09-07T11:56:11Z 2001-09-01 2001 2006-02-09 Dissertation Moeng, MM 2001, Terthienyl carbine complexes, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/27651 > H811/ag http://hdl.handle.net/2263/27651 http://upetd.up.ac.za/thesis/available/etd-02092006-153600/ © 2001 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Carbenes methylene compounds terthienyl UCTD Terthienyl carbene complexes |
| title | Terthienyl carbene complexes |
| title_full | Terthienyl carbene complexes |
| title_fullStr | Terthienyl carbene complexes |
| title_full_unstemmed | Terthienyl carbene complexes |
| title_short | Terthienyl carbene complexes |
| title_sort | terthienyl carbene complexes |
| topic | Carbenes methylene compounds terthienyl UCTD |
| url | http://hdl.handle.net/2263/27651 http://upetd.up.ac.za/thesis/available/etd-02092006-153600/ |