Another possible pathway involves the Wolff rearrangement of ethyl diazoacetate. In this process, the diazo compound rearranges to form a ketene intermediate, which can react with the β-keto ester to produce different products.
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(E)-3-Ethoxycarbonylmethoxy-but-2-enoic acid ethyl ester
2,2,4,4-Tetramethyl-thietane-3-carboxylic acid methyl ester
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
