1: 2-propen-2-ylmagnesium bromide With CuNr*DMS in tetrahydrofuran T=-30°C; 0.333333 h; 2: 6-oxa-bicyclo[3.1.0]hexane in tetrahydrofuran T=-30 - 20°C;

jones reagent in diethyl ether T=0 - 20°C;