1: 2,6,6-trimethyl-cyclohexan-1-one With lithium diisopropyl amide in tetrahydrofuran T=-78 - 0°C; 1 h; 2: Mander's reagent With N,N,N',N',N'',N''-hexamethylphosphoric triamide in tetrahydrofuran T=-78 - 20°C;

1: trans-4-methoxy-3-buten-2-one With n-butyllithium; 1,1,1,3,3,3-hexamethyl-disilazane in tetrahydrofuran T=-78°C; 2: Mander's reagent With N,N,N',N',N'',N''-hexamethylphosphoric triamide in tetrahydrofuran

18-crown-6 ether in dichloromethane 18 h; Ambient temperature;

hydrogenchloride

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