1: 10-P-5 With sodium hydride in tetrahydrofuran; mineral oil T=0°C; 1 h; Inert atmosphere; 2: acetophenone in tetrahydrofuran; mineral oil T=0°C; Horner-Wadsworth-Emmons olefination; 48 h; Inert atmosphere; optical yield given as percent destereoselective reaction;