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The synthesis of azelaic acid (2) from oleic acid (4) described in this paper. (i) H2O2 35%, Novozyme 435, acetonitrile, 5 h, 50 °C; (ii) NaHSO3 saturated solution, H2SO4 2 M, 3 h, r.t.; (iii) atmospheric O2, cat. Fe(NO3)3∙9 H2O/TEMPO/NaCl, toluene, 5 h, 100 °C; (iv) 35% H2O2, toluene, 3 h, 30 °C.
