Asymmetric synthesis. Part 6. Copper salt promoted grignard reagent additions to ethyl 2,3-dideoxy-4,5:6,7-di-O-isopropylidene-D-arabino-trans-hept-2-enonate and subsequent formation of optically active 2-alkyl (or aryl) butane-1,4-dioic acids and butyro-1,4-lactones

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