9. Solvent-dependent ambident nucleophilicity of phenoxide ion towards nitroporphyrins: synthesis of 2-hydroxyaryl- and 2-aryloxy-5,10,15,20-tetraphenylporphyrins by displacement of a nitro group Maxwell J. Crossley,Lionel G. King,Janelle L. Simpson J. Chem. Soc. Perkin Trans. 1 1997 3087