Synthesis of Z and E-(2',5'-dimethoxyphenyl)-methylene-butyrolactones

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A pair of Z and E isomers of cyclization of γ-ketoacid 7,which was prepared in six steps from 2,5-dimethoxyphenyl acetic acid 1, gave a pair of Z(20%) and E (4%) isomers of (2,5-dimethoxyphenyl)-methylene-butyrolactones
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