in xylene 6 h; Heating;

potassium hydroxide; zinc copper 1.) ether, reflux, 20 h, 2.) ethanol, 65 deg C, 16 h; Yield given. Multistep reaction. Yields of byproduct given;

1: ethyl 2-trimethylsilyloxycinnamate With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 1 h; 2: methyl iodide in tetrahydrofuran T=23°C; 16 h; Further stages.;