Model Reactions for Sterically Controlled Syntheses of Cyclohex-2-enones with 4,4- or 5,5-Quaternary Centers: A Direct Chiral Synthesis of 4-Allyl-4-cyanocyclohex-2-enone from the Anion of (+)-Tricarbonyl(5-cyano-2-methoxycyclohexa-1,3-diene)iron

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