Vilsmeier-Haack reaction has been found to be an excellent method for the formylation of a variety of hydrazones to yield the corresponding 4-formylpyrazoles.
CITATION STYLE
Singh, K., Ralhan, S., Sharma, P. K., & Dhawan, S. N. (2005). Vilsmeier-Haack reaction on hydrazones: A convenient synthesis of 4-formylpyrazoles. Journal of Chemical Research, (5), 316–318. https://doi.org/10.3184/0308234054323959
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