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Scheme 1. Reagents and conditions: (i) Polyphosphoric acid (PPA), 220 o... | Download Scientific Diagram
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Plausible reaction mechanism of PPA/SiO2 catalyst activity in the... | Download Scientific Diagram
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Scheme 1 Reagents and conditions: (a) polyphosphoric acid (PPA), 220 C,... | Download Scientific Diagram
