43 metal acetylacetonates of 39 different elements were volatilized and eluted by hyperpressure gas chromatography at 115°C and 800–1000 psi (1). Dichlorodifluoromethane was used as the carrier (and solvent) gas. The temperature of 115°C is substantially lower than those required for the conventional GC of most acetylacetonates. Evidence is presented for the elution of 23 of these chelates without decomposition. Columns of Epon 1001 resin on Chromosorb W retard selectively the elution of the Ru(III), Co(III), Rh(III), Ir(III), Pd(II) and Pt(II) chelates. Partial separations of many elements from Ru(III), Co(III), Rh(III) or Ir(III) from Pd(II) and from Pt(II) were effected. Ir(III) acetylaceonate is the first compound of this element to be gas chromatographed.