1976 Volume 1976 Issue 4 Pages 663-669
The reactions of bivalent transition metal acetylacetonates (M (acac)2) with ethylene glycol (EG)were studied at 150°C. Mixed complexes of Co (II), Zn(II), and Ni (II). containing, both EG and acac were isolated, and characterized by the measurements of electronic, infrared as well as pmr spectra, X-ray diffraction and elemental analysis. The reaction of Co (acac)2(H2O)2 or Co (acac)3 with EG affords Co(acac)2(eg), and the similar reaction with Zn (acac)2 affords Zn (acac) (eg). These mixed complexes contain chelated structure with EG; however, Ni (acac)2 (H2O)2 affords Ni ( acac)2 (H2O) (eg), which dose not contain chelated structure with EG, and no such mixed chelate is obtained in the case of Cu (acac)2. On the basis of these results, the reaction mechanisms were discussed. The kinetics of transesterification reactions of dimethyl terephthalate. (DMT) with EG catalyzed by these isolated mixed complexes was studied at 140-160°C and. compared with the similar reaction catalyzed by metal acetylacetonaw. The catalytic activities of Co (acac)2(eg) and Zn (acac) (eg) are higher than those of Co (acac)2(H2O)2 and Zn(acac)2. However the activity of Ni (acac)2(H2O)(eg) is inferior to th at of Ni (acac)2(H2O)2.
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