Abstract 1,3‐Dipolar cycloaddition of (E)‐ and (Z)‐arylidene‐1‐tetralone derivatives affords trans‐ and cis‐spiro‐1‐pyrazolines, respectively, regio‐ and stereo‐selectively in a one‐step reaction. These rearrange into spiro‐2‐pyrazolines on proton catalysis. The relative configurations and conformations of the spiropyrazolines were elucidated by different NMR methods.
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Tóth et al. (1992) studied this question.
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