Abstract
Soluble metal-free and metal (copper (II), iron (III), and cobalt (II)) phthalocyanine tetracarboxylic acids (5–8) were synthesized using a novel method consisting of improved hydrolysis based on the diazo reaction. The obtained compounds (5–8) were characterized by X-ray diffraction, UV–Vis spectrometry, and FT-IR spectrometry and then utilized as catalysts for the epoxidation of cyclohexene with molecular oxygen as oxidant. Reaction conditions including reaction time, temperature, catalyst amount, and isobutyraldehyde/cyclohexene ratio were optimized to achieve the highest selectivity of cyclohexene oxide. Metal-free phthalocyanine tetracarboxylic acid (5) and metal (copper (II), iron (III), and cobalt (II)) phthalocyanine tetracarboxylic acids (6–8, respectively) were compared. Complexes 6–8 exhibited higher catalytic activity than compound 5 under the optimal conditions.
Graphical Abstract
Four soluble metal-free and metal PTCs were synthesized using a novel method, and were utilized as catalysts for the epoxidation of cyclohexene with molecular oxygen as the oxidant. A total of 58.1% selectivity and yield of cyclohexene oxide were achieved under the optimal condition.
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Acknowledgments
The work was supported by the Shanghai Natural Science Foundation (No. 4ZR1440900) and Shanghai Alliance Program (No. LM201336). The authors thank the Analysis and Testing Center of Shanghai Institute of Technology for support.
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Sun, X., Wang, L. & Tan, Z. Improved Synthesis of Soluble Metal-Free/Metal Phthalocyanine Tetracarboxylic Acids and Their Application in the Catalytic Epoxidation of Cyclohexene. Catal Lett 145, 1094–1102 (2015). https://doi.org/10.1007/s10562-015-1500-0
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DOI: https://doi.org/10.1007/s10562-015-1500-0