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吡咯、苯甲醛在酸催化下生成环状中间体,不可逆的转化生成TPPH_2与TPC;在硝基苯存在下TPC被氧化成TPPH_2。
Pyrrole and benzaldehyde formed cyclic intermediates under acid catalysis and irreversibly converted to TPPH_2 and TPC. TPC was oxidized to TPPH_2 in the presence of nitrobenzene.