Transformations of formaldehyde and glycolaldehyde during the hydroformylation of formaldehyde in the presence of rhodium catalysts |
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Authors: | N N Ezhova G A Korneeva E V Slivinsky R A Aronovich |
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Institution: | (1) A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prosp., 117912 Moscow, Russian Federation |
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Abstract: | Hydroformylation of formaldehyde to give glycolaldehyde (GA) in the presence of RhCl(PPh3)3, RhCl(CO)(PPh3)2, or the RhCl3 + PPh3 system inN,N-dimethylacetamide was studied. The hydroformylation is accompanied by the Cannizzaro-Tishchenko reaction, condensation of CH2O with GA to give C3-C16 polyoxyaldehydes (POA), and dimerization of GA. The formation of POA, which probably occurs through coordination of GA with a Rh atom, predominates among the side reactions. The optimum conditions for hydroformylation of CH2O were found to be: RhCl3 + PPh3 as the catalyst,T 383 K,
12MPa, H2O] 1.8 mol L–1, Rh] 2.5 · 10–3 g-at. L–1, and CH2O] 0.03 g L–1. At a substrate conversion of 62–67 %, the selectivity of GA formation reaches 96 %, and the yield is 60–65 %.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 75–78, January, 1995. |
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Keywords: | formaldehyde hydroformylation glycolaldehyde rhodium catalysts |
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