1: (Z)-3-iodo-3-methylpropenoic acid With tetrabutylammomium bromide; palladium diacetate; triphenylphosphine in N,N-dimethyl-formamide T=20°C; 0.166667 h; 2: (tri-n-butylstannyl)-1,2-butadiene in N,N-dimethyl-formamide 4 h;

AlCl3, aluminium chloride in dichloromethane 3 h; Inert atmosphereCoolingReflux;

1: AlCl3 / CH2Cl2 2: AcOH; H2SO4 View Scheme

1: 95 percent / H2SO4 2: AlCl3 / CH2Cl2 3: AcOH; H2SO4 View Scheme

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium diisopropyl amide 1.) THF, -78 deg C, 45 min, 2.) THF; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;