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Cyclopropanedicarboxylic acid anhydride can be converted to 4-substituted 3-oxabicyclo-[3.1.0]hexan-2-one by reaction with Grignard reagents in ether or tetrahydrofuran solution.
Cyclopropanedicarboxylic acid anhydride can be converted to 4-substituted 3-oxabicyclo- [3.1.0] hexan-2-one by reaction with Grignard reagents in ether or tetrahydrofuran solution.