Mg-Al mixed oxides as highly active acid-base catalysts for cycloaddition of carbon dioxide to epoxides

Journal of the American Chemical Society

Volumn 121, Issue 18, 1999, Pages 4526-4527

  Yamaguchi, Kazuya ^a   Ebitani, Kohki ^a   Yoshida, Tomoko ^b   Yoshida, Hisao ^b   Kaneda, Kiyotomi ^a  

^a OSAKA UNIVERSITY   (Japan)

^b NAGOYA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM OXIDE; CARBON DIOXIDE; EPOXIDE; MAGNESIUM OXIDE;

ARTICLE; CARBON DIOXIDE FIXATION; CATALYSIS; CHEMICAL REACTION; CYCLIZATION; STEREOSPECIFICITY;

EID: 0033549092     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9902165     Document Type: Article

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13. 2 (5 atm). The resulting mixture was stirred at 100°C for 15 h. The hydrotalcite was separated by filtration. The filtrate was subjected to column chromatography on silica gel and yielded styrene carbonate (1.20 g, 91%). The spent Mg-Al mixed oxide was calcined at 400°C, and then the calcined mixed oxide could be reused without losing its high catalytic activity and selectivity.
14. 2 pressure during 1-20 atm did not strongly influence the yields of styrene carbonate under our reaction conditions. The increase of the reaction temperature over 120°C resulted in low selectivity to carbonate because of the formation of styrene glycol.
15. The relative reactivity of para-substituted styrene oxides was examined to give p-methylstyrene oxide (1.3), styrene oxide (1.0), and p-chlorostyrene oxide (1.0). The values in the parentheses are relative initial rates for the addition reaction, which are normalized to that of styrene oxide.
16. D +5.8° (neat).
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20. 3+ as evidenced by Al K-edge XANES.
21. -1.