Homojen katalizörlerin heterojenleştirilmesi ve özelliklerinin incelenmesi
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Dosyalar
Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
İnönü Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/embargoedAccess
Özet
Bu çalışmada, Suzuki-Miyaura eşleşme reaksiyonlarında kullanılmak üzere yeni nesil, çevre dostu, özgün N-heterosiklik karben-Palladyum-piridin (NHC-Pd) kompleksi içeren polimer destekli katalizörler sentezlenmiştir. Bu katalizörlerin destek maddesine tutturulması işlemi, NHC-Pd komplekslerinin, AAm ve AMPS monomerleri ile çaprazbağlı olarak polimerleşmesiyle sağlanmıştır. Bütün polimerizasyon işlemlerinde çözeltide serbest radikal zincir polimerizasyon yöntemi uygulanarak, yığın halde jeller sentezlenmiştir. Sentezlenen NHC-Pd komplekslerin yapısal karakterizasyonu için NMR, polimer yapıların ve polimer-Pd katalitik sistemlerin karakterizasyonu için FT-IR, SEM-EDX, SEM-MAPPING, TEM ve TGA analiz teknikleri uygulanmıştır. Sentezlenen katalizörlerin, sulu ortamda yürütülen arilbromürlerin Suzuki-Miyaura eşleşme reaksiyonlarında yüksek aktiviteye sahip oldukları saptanmıştır. Bromasetofenon ve Bromanisol substratlarının heterojen Suzuki eşleşme reaksiyonu kinetik verileri incelenerek, deneysel verilerle uyumlu reaksiyon kinetik ifadesi türetilmiştir. Elde edilen katalizörler beş defa heterojen Suzuki eşleşme reaksiyonlarında aktivite kaybına uğramadan kullanılmıştır.
In this study, new generation, environmental safe, novel polymeric heterogeneous catalysts which included N-heterocyclic carbene-Palladium-Pyridine (NHC-Pd) complexes were prepared and used in Suzuki coupling reactions. These heterogeneous catalysts were synthesized by polymerization of NHC-Pd complexes (macro monomer) with AAm and AMPS monomers in the presence of crosslinker. Porous bulk hydrogels were prepared via free radical polymerization method. The structural characterization of NHC-Pd and crosslinked polymeric catalyst systems were made by using NMR and FT-IR, SEM-EDX, SEM-MAPPING, TEM and TGA analysis techniques, respectively. It was detected that the synthesized polymer based catalysts have high catalytic activity in heterogeneous Suzuki reaction of aryl bromides. For the heterogeneous Suzuki coupling reactions of bromoacetophenone and bromoanisole substrates kinetic models were derivated by via experimental reaction kinetic data. The polymeric hydrogel NHC-Pd catalysts exhibited good stability and could be reused at least five times without remarkable loss of its catalytic activity.
In this study, new generation, environmental safe, novel polymeric heterogeneous catalysts which included N-heterocyclic carbene-Palladium-Pyridine (NHC-Pd) complexes were prepared and used in Suzuki coupling reactions. These heterogeneous catalysts were synthesized by polymerization of NHC-Pd complexes (macro monomer) with AAm and AMPS monomers in the presence of crosslinker. Porous bulk hydrogels were prepared via free radical polymerization method. The structural characterization of NHC-Pd and crosslinked polymeric catalyst systems were made by using NMR and FT-IR, SEM-EDX, SEM-MAPPING, TEM and TGA analysis techniques, respectively. It was detected that the synthesized polymer based catalysts have high catalytic activity in heterogeneous Suzuki reaction of aryl bromides. For the heterogeneous Suzuki coupling reactions of bromoacetophenone and bromoanisole substrates kinetic models were derivated by via experimental reaction kinetic data. The polymeric hydrogel NHC-Pd catalysts exhibited good stability and could be reused at least five times without remarkable loss of its catalytic activity.
Açıklama
Anahtar Kelimeler
Kimya mühendisliği, Chemical engineering
Kaynak
WoS Q Değeri
Scopus Q Değeri
Cilt
Sayı
Künye
Boztepe, C. (2017). Homojen katalizörlerin heterojenleştirilmesi ve özelliklerinin incelenmesi.İnönü Üniversitesi. Malatya.
