1: 4-iodobenzoic acid ethyl ester With isopropylmagnesium chloride lithium chloride complex in tetrahydrofuran T=-40°C; 0.833333 h; 2: With copper(l) iodide in tetrahydrofuran T=-15°C; Grignard Reaction; 0.133333 h; 3: cyclopentane carboxylic acid chloride in tetrahydrofuran T=-40 - 0°C; 3 h;