(CH3)3CBr in diethyl ether addn. of MeLi to Fe-complex in diethyl ether at -78°C (under N2), stirring at -78°C for 7 h, treatment with (CH3)3CBr at -78°C, allowing to warm to room temp.; filtration through alumina, column chromy. (SiO2, light petroleum-diethyl ether, 9:1);

1-bromo-1,1-dimethylethane 1.) diethyl ether, -78 deg C, 7 h; 2.) diethyl ether, -78 deg C to r.t.; Yield given. Multistep reaction;