potassium hydroxide in methanol T=20°C;

1: 1-phenylcycloprop-2-ene-1-carboxylic acid With methyllithium in tetrahydrofuran; diethyl ether T=-78 - -40°C; 0.2 h; 2: With zinc(II) chloride in tetrahydrofuran; diethyl ether T=-78°C; 0.0833333 h; 3: iodobenzene Further stages;