1: 2-bromobenzylmethyldiphenylphosphonium 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: 2-bromobenzylmethyldiphenylphosphonium 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;

1: 2-bromobenzylmethyldiphenylphosphonium 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;