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The reaction of LnCl3 with two equivalents of 2,4-dimethyl-pentadienyl potassiumaffords (2,4-C7H11)3Ln(Ln=Dy,Er). The compound (2, 4-C7H11)3Dy(1), crystallized froma mixed solvent of hexane and THF has a triclinic space group Pl with a=l. 270 2(2) nm,b=l.