Treatment of [Rh(nbd)2]+BF.-or [Rh(cod)2]+BF4-(nbd = norbornadiene. cod = cyclo-octa-1.5-diene) with arenes leads to the displacement of nbd or cod and the formation of [Rh(nbd)(arene)]+BF.-(arene = CsMes. 1.3.5-CsHaMea. 1.3-C6 H.Me2. CsHoMe. CsHs. CsHsOH. or C6 HsOMe) and [Rh(cod)(arene)]+BF.-(arene = CsMes. 1.3.5-CsHaMea. 1.3-CsH.Me2. or CsHoMe). Analogous reactions with benzonitrile and aniline gave instead the complexes [Rh(nbd)(C sH.CN)2]+BF4-and [Rh(nbd)(CsHsNH 2h]+BF.-; dimethyl sulphoxide reacts similarly to give [Rh(cod)(Me2SO)2]+BF.-. Reaction of [Rh(C 2 H')2(acac)] with PhaG+BF.-and an arene affords [Rh(C 2H')2(arene)]+BF.-(arena = CsMes. 1.3-CsH.Me2• or CsHs). Bicyclo[2.2.1] heptadiene is dimerised and trimerised catalytically by [Rh(nbd)2] + B F. -; the mechanism of this reaction is discussed. Cycloheptatriene (cht) displaces nbd or cod to form [Rh(nbd)(cht)]+BF.-and [Rh(cod)-(cht)]+BF.-. which are considered to involve cht bonded in the 1T(h 6 ) form. Cyclohexa-1.3-diene is disproportionated by [Rh(nbd)2] +BF.-to cyclohexene and benzene; the 1,4-diene undergoes isomerisation before disproportionation. Sodium benzoate and acetate form bridged carboxylates [Rh(nbd)(rc0 2)]2 on reaction with [Rh(nbd) 2] + B F. -.

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