in diethyl ether 48 h; Inert atmosphere;

titanium(IV) isopropylate; 4-bromooctafluorobutanetriethoxysilane 1.) THF, 67 deg C, 2.) reflux, 30 min; Yield given. Multistep reaction;

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1: benzyl(methyl)diphenylphosphonium bromide With sodium hexamethyldisilazane in tetrahydrofuran Wittig reaction; 1 h; Inert atmosphere; 2: benzaldehyde in tetrahydrofuran T=-78 - 20°C; Wittig reaction; Inert atmosphereCooling with acetone-dry ice; optical yield given as percent dediastereoselective reaction;

1: benzyl(methyl)diphenylphosphonium bromide With sodium hexamethyldisilazane in tetrahydrofuran Wittig reaction; 1 h; Inert atmosphere; 2: ortho-bromobenzaldehyde in tetrahydrofuran T=-78 - 20°C; Wittig reaction; Inert atmosphereCooling with acetone-dry ice; optical yield given as percent dediastereoselective reaction;