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Chemo-and Regioselective 1,3-Dipolar Cycloaddition of 2-Diazopropane over 1,4-Benzoquinone: Synthesis of New Pyrazoloquinones. -1,3-Dipolar cycloaddition of diazopropane (II) with benzoquinone affords bis-cycloadducts (IV) and (V) along with minor amounts of mono-adduct (III). Similar reaction of bis-adduct (V) with diazopropane (II) gives exclusively O-alkylation products. Swern oxidation of the adducts furnishes the corresponding pyrazolenines. -(BEN HAMADI*, N.; LACHHEB, J.; GUERFEL, T.; MSADDEK, M.; Synth. Commun. 43 (2013) 6, 859-864, http://dx.doi.org/10.