... Rough calculations suggest that pentafluorobenzene is between 10"2 and 10~3 times less reactive than 1,2,3,4- and 1,2,3,5-tetrafluorobenzenes which in turn are 10"" ^lO"3 less reactive than benzotrifluoride. 1,2,4,5-tetrafluorobenzene again was anomalous as no reaction took place as detectable by GLC. ... 2. PC Coe, AE Jukes, JC Tatlow. J. Chem. Soc., C (1966), p. 2323. 3. ... Soc. (1961), p. 802. 11. GM Pearl and PL Coe, unpublished. 12. S. Ezmirley, unpublished ...