(i) KOtBu, (ii) /BRN= 386014/, tBuOH; Multistep reaction;

(i) KOtBu, (ii) /BRN= 385877/, tBuOH; Multistep reaction;

methyl iodide Heating;

in tert-butyl alcohol T=83°C; 6 h;

in tetrahydrofuran N2-atmosphere; mixing phosphonium salt with LiBu (0°C), addn. of Fe-complex (0°C), stirring (overnight, room temp.), pptn. (pentane, removal of Ph3PO), filtration (silica gel), evapn.; dissoln. in THF, addn. of KOtBu (room temp., 18 h); addn. of pentane, hydrolysis, chromy (silica gel, pentane-ether 9:1);