1.The action of nucleophilic and electrophilic reagents on the dichloromethyl group was studied on the example of 1,1-dichloroheptane.2.The dichloromethyl group is more inert toward the action of nucleophilic reagents than the chloromethyl group; only under the action of such strong nucleophiles as sodium thiophenolate could both of the chlorine atoms be replaced.3.The dichloromethyl group, in contrast to the trichloromethyl group, isinert toward the action of such electrophilic reagents as concd. sulfuric and anhydrous nitric acids. However, compounds containing the dichloromethyl group are capable of condensing with benzene in the presence of aluminum chloride.