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Synthesis of the TMP complexes 6a–6i. Reagents and conditions: (a) 30% H2O2, CH3COOH, 95 °C, 2 h; (b) (CH3CO)2O, 140 °C, 2.5 h; (c) CH3ONa, CH3OH, r.t., 0.5 h; (d) SOCl2, CH2Cl2, r.t., 2.5 h; (e) n-diaminoalkane (piperazine and monoethanolamine), K2CO3, CH3CN, 95 °C, 2 h.
