1: 6-phenylthio-1-heptene With 4,4'-di(tert-butyl)-[1,1-biphenyl]yllithium in tetrahydrofuran T=-78°C; 0.25 h; 2: carbon dioxide in tetrahydrofuran 1 h; cooling;

1: 1,1-bis(phenylthio)ethane With lithium 1-(dimethylamino)naphthalenide 0.166667 h; cooling; 2: 5-bromo-1-pentene T=-78 - -20°C; 2.5 h;