Highly active and selective catalysts for olefin hydrosilylation reactions using metalloporphyrins intercalated in natural clays (DOI: 10.1039/c5re00010f )

Hikmat S. Hilal's picture
Journal Title, Volume, Page: 
Reaction Chemistry and Engineering-Royal Chemical Society- 1 (2016) 194-203
Year of Publication: 
2016
Authors: 
Waheed Jondi
An-Najah National University
Current Affiliation: 
An-Najah National University
Ahed Zyoud
An-Najah National University
Current Affiliation: 
An-Najah National University
Ahmad Qasem Hussein
University of Jordan
Current Affiliation: 
University of Jordan
Hikmat S. Hilal
An-Najah National University
Current Affiliation: 
An-Najah National University, Graduated
waseem mansour
An-Najah National University
Current Affiliation: 
An-Najah National University
Preferred Abstract (Original): 
TetraIJ4-pyridyl)porphyrinato-manganeseIJIII)(MnTPyP
+
) ions intercalated inside nano- and micro-size natural
clay powders effectively catalyzed the hydrosilylation reaction of 1-octene and triIJethoxy)silane under
mild conditions. The results showed that the homogeneous MnTPyP
+
ions catalyzed the reaction where
both branched and linear products were observed. Intercalation significantly enhanced both catalyst activity
and selectivity. Production of the linear triIJethoxy)silyl-1-octane as sole product was confirmed by FT-IR
and NMR spectra, in the case of the intercalated catalyst. The activity enhancement was more pronounced
in the case of the nano-particle supported catalyst system, with turnover frequency (TF) values up to 1200
min
−1
and 85% conversion observed in less than 20 min. The intercalated catalyst systems were easy to
recover and were reused three times, while retaining up to 80% of their original activity. Effects of different
reaction parameters on the initial reaction rate, such as clay particle size, solvent polarity, reactant concentration,
catalyst loading and temperature, were investigated. A new plausible mechanism, with evidence

and justifications, is proposed.

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