carbon dioxide; isopropylmagnesium chloride in tetrahydrofuran; diethyl ether 0.25 h; multistep; Product distributionMechanism;

1: With 1-methyl-pyrrolidin-2-one in tetrahydrofuran; hexane T=-50 - 0°C; 4 h; 2: With iodine in tetrahydrofuran; hexane T=-50 - 20°C;

iodine

in diethyl ether; dichloromethane 1. -90 deg C, 45 min 2. warm up to -10 deg C in 2 h;

1: n-butyllithium With zinc dibromide in tetrahydrofuran; hexane T=-40 - 20°C; 2: 1,1-diiodopentane in tetrahydrofuran; hexane T=-40 - 0°C; 2 h; 3: With iodine in tetrahydrofuran; hexane T=-50 - 20°C;