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Formylation, synthesis of benzaldehydes

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O-Aryl N-isopropylcarbamates, conveniently prepared from phenols and isopropyl isocyanate, are subjected to an efficient ortho-lithiation protocol to afford the corresponding salicylaldehydes in a one-pot operation in high yields.
M. Kauch, D. Hoppe, Synthesis, 2006, 1575-1577.


Reaction of nitroarenes with tris(benzotriazol-1-yl)methyl anion followed by treatment with zinc bromide and hydrochloric acid yielded the corresponding p-nitroarylaldehydes in good to excellent yields.
A. R. Katritzky, L. Xie, Tetrahedron Lett., 1996, 37, 347-350.