This paper reports the results of studies on the reactions of trialkylsilyl- and germyl- pentafluorobenzenes with O-, N, S- and C-nucleophiles, and with LiAlH4. Depending on the nature of the nucleophilicreagent, its attack is oriented towards a heteroatom (RO−, RS−), the C-4 atom of the pentafluorophenyl ring (BuLi, LiA1H4, piperidyl-lithium) or at both electrophilic centres (piperidine, RS−).