The catalytic oxidation of cis-2-butene and propylene with molecular oxygen in the presence of a well-defined surface coordination compound, (≡SiO)₂Mo(═O)₂, affords acetaldehyde. Using a cis-2-butene/O₂ feed at 350–400 °C, the reaction yields a conversion of approximately 10% and an acetaldehyde selectivity of approximately 70%. This performance is maintained up to an experimental time of 20 h in a continuous flow reactor. The Mo(bis-oxo) surface compound was fully characterized by multiple spectroscopic techniques as well as surface microanalysis. The results from quantum mechanics calculations indicate that the reaction proceeds via [2 + 2] cycloaddition/cycloelimination steps with the formation of metalla-oxacyclobutane intermediates, analogous to the Chauvin mechanism in olefin metathesis.

中文翻译：

---

单点烯烃复分解催化剂（≡SiO）₂ Mo（═O）_2的分子氧将2-丁烯氧化为乙醛

顺式-2-丁烯和丙烯的催化氧化在良好定义的表面配位化合物的存在下用分子氧，（≡SiO）₂的Mo（= O）₂，得到乙醛。使用顺式-2-丁烯/ O ₂在350-400°C的温度下进料，该反应的转化率约为10％，乙醛的选择性约为70％。在连续流反应器中，该性能可维持至20 h的实验时间。Mo（bis-oxo）表面化合物已通过多种光谱技术以及表面微分析得到了充分表征。量子力学计算的结果表明，该反应通过[2 + 2]环加成/环消除步骤进行，形成了金属-氧杂环丁烷中间体，类似于烯烃复分解中的Chauvin机理。