1,1-Dicyclopropylallene: cycloadditions and dimerization. Dependence of the regioselectivity on solvent polarity and Lewis acid catalysis in the reactions with alkoxycarbonyl-activated olefins
1,1-Dicyclopropylallene: cycloadditions and dimerization. Dependence of the regioselectivity on solvent polarity and Lewis acid catalysis in the reactions with alkoxycarbonyl-activated olefins