- 作者: 陳義雄; 卓靜哲
- 作者服務機構: Department of Chemistry, Cheng Kung University, Tainan, Taiwan 700
- 中文摘要: In the presence of a relatively small amount of bromate, maleic acid in aqueous sulfuric acid isomerizes catalytically to fumaric acid in the dark at room temperature. The concomitant presence of a suitable amount of bromine in CCl/sub 4/ phase raises the rate and yield significantly. The yield and rate of isomerization depend on the relative amounts of maleic acid, bromate, bromine, and sulfuric acid. For a favorable condition, nearly 90% yield can be obtained. Raising the temperature accelerates the production of fumaric acid while decreases the final yield. The isomerization reaction competes favorably with the redox reaction at room temperature while the latter dominates at high temperature. For the heterogeneous case, the agitation of the reaction mixture delays the isomerization. The presence of cumene or benzene inhibits the isomerization. Hypobromous acid is proposed to play a major role in catalyzing the isomerization. A mechanism is proposed to rationalize the experimental results.
- 英文摘要: --
- 中文關鍵字: Bromate; bromine; maleic acid; fumaric acid.
- 英文關鍵字: Bromate; bromine; maleic acid; fumaric acid.