1) C6H5-COONa + NaOH (сплав.) = C6H6 (X1) + Na2CO3;
2) C6H6 + H3C-CH=CH2 (+H3PO4) = C6H5-CH(CH3)2 (X2);
3) C6H5-CH(CH3)2 + Cl2 (+hv) = C6H5-C(Cl)(CH3)2 + HCl;
4) C6H5-C(Cl)(CH3)2 + KOH (спирт. р-р) = C6H5-C(CH3)=CH2 (X3) + KCl + H2O;
5) 3C6H5-C(CH3)=CH2 + 8KMnO4 (нагр.) = 3C6H5-C(O)-CH3 (X4) + 3K2CO3 + 2KOH + 8MnO2 + 2H2O.