AbstractVapour‐phase bromination (375‐475°) as well as chlorination (350‐450°) of benzotrifluoride led to halogenobenzotrifluorides containing 53‐54%meta, 30‐32%paraand 13‐17%orthoisomers. Dihalogeno compounds were only formed to a small extent, except at high conversions. Liquid‐phase nitration of benzotrifluoride produced about 91%meta, 3%paraand 6%orthoisomer.Competitive chlorinations at 400° indicated that benzotrifluoride has about the same reactivity as benzonitrile, chloro‐ and fluoro‐benzene and is 3‐4 times less reactive than benzene.These and earlier dataPart VI:J. W. EngelsmaandE. C. Kooyman, Rec. Trav. Chim.80, 537 (1961. Parts VII and VIII of this series deal with liquid‐phase halogenations:E. C. KooymanandR. Louw, Rec. Trav. Chim.81, 365 (1962) and82, 616 (1963.can be accommodated by a mechanismE. C. Kooyman, Pure and Applied Chemistry7,193 (1963), (IUPAC Congress Lecture, London, July 1963.involving hydrogen‐loss as the isomer‐pattern determining step in gas‐phase halogenations of aromatic compounds, possibly through a posit