The effects of temperature and benzo crown ether (BCE) concentration upon the conductivity of the system aerosol OT (ACT) + 2,2,4-trimethylpentane (isooctane) + water have been studied. The BCEs (phase-transfer catalysts) used in the ternary systems were 2,3-benzo-1,4,7,10-tetraoxacyclododec-2-ene (benzo-12-crown-4, BC4), 2,3-benzo-1,4,7,10,13-pentaoxacyclopentadec-2-ene (benzo-15-crown-5, BC5), and 2,3-benzo-1,4,7,10,13,16-hexaoxacyclooctadec-2-ene (benzo-18-crown-6, BC6). The behaviors observed were compared with previous ones obtained in the presence of cryptand complexes (CC) and crown ethers (CE) with electrical conductivity.