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C2F5‐substituted pyrazolines were synthesized by [3+2]‐cycloaddition between in‐situ‐generated C2F5CHN2 and electron‐deficient alkenes. The addition of DBU led to the elimination of HF to give CF3CHF‐substituted pyrazoles. Depending on the structure of the pyrazolines, different products were obtained.
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