Thermal reaction of 3-phenylsydnone with isoprene or 2,3-dimethylbutadiene gave 2-methyl- or 2,6-dimethyl-7-phenyl-1,7-diazatricyclo [2.2.1.02,6]heptane, together with 3-isopropenyl-1-phenylpyrazole. The former is the product of the double 1,3-dipolar cycloaddition. A similar reaction with 1,3-butadiene gave only 3-vinyl-1-phenylpyrazole.
Die thermische Reaktion des Sydnons (I) mit Isopren (IIa) liefert ein 1:1‐Gemisch aus dem Diazatricycloheptan (IIIa) und dem Pyrazol (IV); unter analogen Bedingungen entsteht aus (I) und dem Dimethylbutadien (IIa) ein 1:4‐Gemisch aus (IIIb) und (IV).
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