Under the conditions of interphase catalysis the dihlorcyclopropanation of fraction C₅ of liquid pyrolysis products of the oil hydrocarbons was carried out and heme-dichlorosubstituted vinyl cyclopropanes and tetrachlorobicyclopropyls have been synthesized. The optimal conditions of preparation of these compounds have been found. The possibility of carrying out the dichlorocyclopropanation reaction of non-fractionated liquid pyrolysis products has been revealed and it has been shown that in this case, along with mono- and bis-adducts, the addition products of dichlorocarbene to alkenes being a part of pyrocondensate are formed.