An efficient [3 + 2] cycloaddition reaction of difluoromethyl or trifluoromethyl hydrazonoyl bromides with trifluoromethyl-substituted alkenes is investigated to produce a variety of 3,5-bis(fluoroalkyl)pyrazoles/pyrazolines in moderate to good yields. This protocol features obvious advantages such as easily available and stable substrates, step economy, gram-scalable and simple operation, which provides a novel and practical method for the preparation of 3,5-bis(fluoroalkyl)pyrazoles/pyrazolines.

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