Catalytic activity of metal carbenes, synthesized with atomic carbon and tungsten hexachloride (WCl6), in olefin metathesis reactions
dc.contributor.advisor | Sevin Düz, Fatma | |
dc.contributor.advisor | Düz, Bülent | |
dc.contributor.author | Yüksel, Dilek | |
dc.date.accessioned | 2020-12-30T06:57:07Z | |
dc.date.available | 2020-12-30T06:57:07Z | |
dc.date.submitted | 2007 | |
dc.date.issued | 2018-08-06 | |
dc.identifier.uri | https://acikbilim.yok.gov.tr/handle/20.500.12812/480458 | |
dc.description.abstract | Bu çalışmada, tungsten hekzaklorür (WCl6) ve atomik karbonun, sıvı azotla 77 K' esoğutulan bir karbon ark reaktöründe ve yüksek vakum altında gerçekleşen tepkimesiyoluyla tungsten karben sentezi başarılmıştır.Bu koşullarda oluşturulan tungsten karbenin, [W]=CCl2 şeklinde bir yapıya sahipolduğu ve düz zincirli iç ve uç olefinler, 1-okten, 2-okten, 1-hepten, 2-hepten, 1-penten ve 2-pentenin metatez tepkimelerini katalizlediği saptanmıştır.Ayrıca WCl6/ C atomu sistemi içinde [W]=CCl2 nin oluşma mekanizması, bu türüngeometrisi ve bu metal karben varlığında, Chauvin ile Herisson (1971) tarafındanönerilen metal karben metalosiklobütan mekanizması esas alınarak, 1-okten metateztepkimesinin mekanizması teorik olarak incelenmiş, bu amaçla B3LYP/ LANL2DZseviyesinde DFT hesaplamaları gerçekleştirilmiştir.ANAHTAR KEL MELER: Karbon arkı, Olefin Metatezi, Tungsten Karben, DFT. | |
dc.description.abstract | In this study, the synthesis of tungsten based carbenes was achieved via the reactionof tungsten hexachloride (WCl6) and atomic carbon in a carbon arc reactor, whichwas cooled by liquid nitrogen at 77 K under high vacuum.It was found that the tungsten carbene formed under these conditions had a structureas [W]=CCl2 and catalyzed the self metathesis reactions of terminal and internalacyclic olefins, 1-octene, 2-octene, 1-heptene, 2-heptene, 1-pentene and 2-pentene.It was also investigated theoretically, the structure and the mechanism of formation ofthe tungsten carbene, [W]=CCl2, within the WCl6/ C atom system and the energeticsof the metathesis of 1-octene, in the presence of this tungsten carbene, with respectto the metal carbene metallocyclobutane mechanism proposed by Chauvin andHerisson (1971).For this purpose, DFT calculations at B3LYP /LANL2DZ level was performed.KEY WORDS: Carbon arc, Olefin Metathesis, Tungsten Carbene, DFT. | en_US |
dc.language | English | |
dc.language.iso | en | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.rights | Attribution 4.0 United States | tr_TR |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.subject | Kimya | tr_TR |
dc.subject | Chemistry | en_US |
dc.title | Catalytic activity of metal carbenes, synthesized with atomic carbon and tungsten hexachloride (WCl6), in olefin metathesis reactions | |
dc.title.alternative | Atomik karbon ve tungsten hekzaklorür (wcl6) ile oluşturulan metal karbenlerin olefin metatez tepkimelerindeki katalitik aktivitesi | |
dc.type | masterThesis | |
dc.date.updated | 2018-08-06 | |
dc.contributor.department | Kimya Anabilim Dalı | |
dc.identifier.yokid | 185626 | |
dc.publisher.institute | Fen Bilimleri Enstitüsü | |
dc.publisher.university | HACETTEPE ÜNİVERSİTESİ | |
dc.identifier.thesisid | 185641 | |
dc.description.pages | 89 | |
dc.publisher.discipline | Diğer |