Reactions of diazo ketones with activated unsaturated compounds in the presence of gallium trichlorideстатья
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Дата последнего поиска статьи во внешних источниках: 17 декабря 2015 г.
Аннотация:Diazoacetone reacts with methyl acrylate in the presence of anhydrous GaCl3 to give isomeric methyl 2-acetylcyclopropanecarboxylates rather than pyrazolines obtained from diazo esters or by noncatalytic reactions. In a similar reaction, diazoacetophenone yields methyl 2-benzoylcyclopropanecarboxylates, benzoylmethyl acrylate, and benzoylmethyl 2-benzoyl-cyclopropanecarboxylate via partial transesterification. Addition of an equimolar amount of GaCl3 to diazoacetone in the system CH2Cl2-HCl-H2O unexpectedly produces 4,5-dimethyl-furan-3(2H)-one and 1,1'-oxybis(propan-2-one).