Cross-Dehydrocycloaddition of 1,3-Butadiene with Isoprene over MgO and ZrO<sub>2</sub>
作者:Hiroyasu Suzuka、Hideshi Hattori
DOI:10.1246/bcsj.64.1332
日期:1991.4
473 K in order to examine the relation between the product distribution and the reaction mechanisms. Over ZrO2 the most abundant product was 4-ethyltoluene, which was produced by a base-catalyzed Diels–Alder reaction between BD and IPN, followed by double-bond migration and dehydrogenation. In the Diels–Alder reaction, IPN acts as a diene and BD acts as a dienophile. Over MgO, o-xylene was primarily
由等量的 1,3-丁二烯 (BD) 和异戊二烯 (IPN) 组成的混合物在 MgO 和 ZrO2 上在 473 K 下反应,以检查产物分布和反应机制之间的关系。在 ZrO2 上,最丰富的产物是 4-乙基甲苯,它是由 BD 和 IPN 之间的碱催化 Diels-Alder 反应产生的,然后是双键迁移和脱氢。在 Diels-Alder 反应中,IPN 充当二烯,BD 充当亲二烯体。在 MgO 上,邻二甲苯主要通过阴离子机制产生。在BD和IPN形成的产物中,4-乙基甲苯的产量最多,而3-乙基甲苯的产量也相当可观。ZrO2 上的活性位点被 CO2 和 NH3 严重毒害。MgO 上的活性位点被 CO2 完全毒化,