1: 1-phenyl-5-(prop-2'-ene-1'-sulfonyl)-1H-tetrazole With potassium hexamethylsilazane in ethylene glycol dimethyl ether T=-60°C; Metallation; 0.5 h; 2: Decanaldehyde T=-60 - 20°C; Julia olefination; Title compound not separated from byproducts;