芳香族カルボン酸アルカリ塩の熱変換に関する研究-3-安息香酸カリウムの炭酸カリウムおよびシアン酸カリウム存在における熱変換反応
スポンサーリンク
概要
- 論文の詳細を見る
Reactions of potassium benzoate in the presence of potassium carbonate and cyanate have been studied under various conditions. The acids formed were analyzed by vapor phase chromatography after esterification with diazomethane. Maximum yield of terephthalic acid (ca. 60%) was obtained at 380-405°C in 3 hrs and longer heating failed to improve the yield. Effects of the pressure of carbon dioxide and of the molar ratio of potassium carbonate to potassium benzoate were evident. The anion moieties of cadmium compounds did not affect the composition of the products, and the yield of terephthalic acid and the conversion of potassium benzoate were rather reduced in the presence of a large amount of potassium cyanate. In an initial stage of this reaction, considerable amounts of phthalic, isophthalic, and benzene tricarboxylic acids were formed together with terephthalic acid. The direct carboxylation of potassium benzoate with potassium carbonate in potassium cyanate was indicated from the fact that the yield of terephthalic acid was higher than that expected from the disproportionation reaction. On the other hand, in the reaction of sodium benzoate in the presence of sodium cyanate and sodium carbonate, the effect of sodium cyanate could not be demonstrated.In an initial stage of this reaction, sodium benzoate gave only sodium phthalate.
- 社団法人 有機合成化学協会の論文
著者
関連論文
- 芳香族カルボン酸アルカリ塩の熱変換に関する研究-3-安息香酸カリウムの炭酸カリウムおよびシアン酸カリウム存在における熱変換反応
- ヘンケル法による芳香族ジカルボン酸の合成
- 芳香族カルボン酸アルカリ塩の熱交換に関する研究-2-ベンゾニトリルと炭酸カリウムの反応によるテレフタル酸の合成
- ジメチル安息香酸およびプソイドキュメンのアルカリ性過マンガン酸カリウム酸化