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Title
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Magnetic Thiaminum Octamolybdate Nanocatalyst for Oxygenation of Styrenes to Benzaldehydes and Tandem Synthesis of Benzimidazoles
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Type
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JournalPaper
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Keywords
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octamolybdate, thiamine, silica-coated γ-Fe2O3, styrene oxygenation, benzimidazoles
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Abstract
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Silica-coated maghemite nanoparticles (γ-Fe2O3) decorated with octamolybdate-containing thiaminium (protonated vitamin B1) produced a four-component nanocatalyst (γ-Fe2O3@ SiO2/VB1/α-Mo8O26 = SMNPB1Mo). The as-prepared material with particle sizes ranging from 10 to 50 nm and a specific surface area of 57 m2/g showed high activity with a TOF of 312 h−1 and excellent selectivity for the conversion of styrenes to benzaldehydes using tert-butyl hydroperoxide as an oxidant followed by a one-pot synthesis of benzimidazoles under solvent-free conditions. A radical pathway was suggested based on scavenging experiments. The catalyst proved to be easily recoverable using a ferromagnet and usable for at least five runs while retaining its activity and structural integrity.
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Researchers
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Axel Klein (Fourth Researcher), M J (Third Researcher), A R (Second Researcher), Maryam Rostaminasab (First Researcher)
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