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Reagents and conditions: (a) p-toluenesulfonic acid monohydrate, toluene, 100 °C, 30 h, 90%; (b)98 tris(n-dodecyloxy)benzylamine (2.05 equiv), zinc acetate, imidazole, 165 °C, microwave, 30 min, 80–90%; (c) n-octadecylamine (1.1 equiv), imidazole, 165 °C, microwave, 35 min, 55%.
