Abstract
Dimethyl 2-arylcyclopropane-1,1-dicarboxylates on heating with GaCl3 undergo dimerization to afford arylnaphthalenes or phenanthrenes. A possible reaction mechanism including elimination of two dimethyl malonate molecules was proposed, dimethyl malonate gallium complex Ga3+[H2C(CO2Me)2]3(GaCl–) was isolated and characterized by X-ray diffraction analysis.
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