1: 3,3-dimethylbutyric acid ethyl ester With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 0.166667 h; 2: dimethyl-disulfide in tetrahydrofuran T=-78 - 20°C;

1: H2S 2: diethyl ether View Scheme

in diethyl ether