1: diethylzinc; dihydro-3-(2-octen-1-yl)-2,5-furandione With [2,2']bipyridinyl; bis(acetylacetonate)nickel(II) in tetrahydrofuran T=0°C; 3 h; 2: diazomethyl-trimethyl-silane With methanol in diethyl ether; benzene T=20°C; 3: With hydrogen Further stages. Title compound not separated from byproducts.;

titanium(IV) isopropylate; titanium tetrachloride 1.) CH2Cl2, -78 deg C, 1 h, 0 deg C, 2 h; 2.) H2O, DME, heating, 3 h; Yield given. Multistep reaction. Yields of byproduct given;

lithium diisopropyl amide 1.) 30 min, -78 deg C 2.) a) ca.-100 deg C b) 5h to 10 deg C; Yield given. Multistep reaction;