A new direct allylation of aromatic compounds has been developed. A mixture of allylsilane, allylgermane, or allylstannane and thallium (III) trifluoroacetate was allowed to react with an aromatic compound, a nucleophile, to give allylation product (s) in good yields via an allylcationic species. Thus, the usefulness of these allylmetal compounds as allyl cation equivalents was established.