Chemistry / Kimya
Permanent URI for this collectionhttps://hdl.handle.net/11147/4072
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Research Project Paladyum N-heterokarben kompleksleri içeren zeolitlerin Heck ve Suzuki tepkimelerinde katalizör olarak kullanılması(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2006) Artok, Levent; Aksın, Özge; Bulut, Hatice; Durgun, GülaySilika bağlı Pd-N-heterosiklik karben kompleksleri ve paladyum yüklü silika bağlı imidazolinyum tuzlan bromoarenlerin Mizoroki-Heck tepkimelerinde yüksek aktivite göstermiştir. Tepkimeler liganddan ayrılan Pd tarafından katalizlenmiştir. Tepkime sonunda Pd silika yüzeyine çökelerek tekrar kazanılmıştır. Pd yüklü NaY zeolit bromoarenlerin Suzuki tepkimelerinde yüksek TOF aktivitesi göstermiştir. Katalizörün aktiflik göstermesi için ortamda suyun bulunması elzemdir. Katalizör kloroarenler için de aktivite göstermiştir. Ancak tepkime ortamında suyun bulunması katalizör aktivitesine olumsuz etki göstermiştir.Conference Object Citation - WoS: 7Citation - Scopus: 8Acylation of 2-Methoxynaphthalene Over Ion-Exchanged Ss-Zeolite(Elsevier Ltd., 2002) Kantarlı, İsmail Cem; Artok, Levent; Bulut, Hatice; Yılmaz, Selahattin; Ülkü, SemraFriedel-Crafts acylation of 2-Methoxynaphthalene was carried out over various ion-exchanged β zeolites (Mn+β, where Mn+: In3+, Zn2+, Al3+, Fe3+, La3+) with various anhydride (acetic, propionic and benzoic anhydrides), or acyl chloride (acetyl, propionyl and benzoyl chlorides) acylating reagents. The results suggested that selectivity towards the 6-substituted products was higher with the larger size anhydrides, propionic and benzoic anhydrides. The metal cation type within the zeolite significantly influenced the extent of conversion and product distribution. That La3+ exchanged zeolite displayed higher selectivity for the 6-position acylated product with anhydrides ascribed mainly to narrowing of channels by the presence of La(OH)2+ ions that leave no room for the formation of more bulky isomeric forms and to enhanced Bronsted acidity of the zeolite. With acyl chlorides, the recovery of ketone products was found to be remarkably low. 1-Acyl-2-methoxynaphthalenes actively underwent deacylation when acyl chlorides were used as the acylation reagent.