Synthesis of acetic acid from methanol alone by homogeneous metal complex catalyst. Part 4. In-situ formation of catalyst species and halogen effect in the RuCl3·3H2O–SnX2 (X=F, Cl, Br, I) composite system |
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Authors: | Li-Chang Yang Tetsu Yamakawa Sumio Shinoda |
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Institution: | Institute of Industrial Science, The University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo 106-8558, Japan |
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Abstract: | Highly selective formation of methyl acetate has been found possible from methanol alone using the catalyst generated in situ from RuCl3·3H2O and SnCl2 as well as SnX2 (X=F, Br, I). The reaction did not occur in the absence of SnCl2 added and the optimum Sn]/Ru] ratio appeared at about 16. The halogen effect showed the order of SnF2>SnCl2>SnBr2>SnI2, which indicates the importance of cationic character of Ru(II) center to facilitate its electrophilic interaction with β-hydrogen of Ru–OCH3 intermediate in the rate-limiting dehydrogenation step. |
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Keywords: | Acetic acid Methanol Methyl acetate Ruthenium complex Tin(II) ligand |
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