A green route for one−pot synthesis of acetals by tandem hydroformylation−acetalization of olefins using supported Rh−based catalysts was developed. Experimental results demonstrated that suitable Rh loading (1 wt%) with appropriate reaction temperature (120 °C) and reaction time (8 h) were favorable for the formation of acetals, and a high acetals selectivity of 94.6% was achieved. More importantly, the selectivity to valuable linear products was enhanced in this tandem catalysis. Based on the catalytic mechanism study, highly dispersed RhOx nanoparticles and abundant acid sites on the supports were responsible for the hydroformylation and acetalization, respectively. One-pot synthesis of acetals directly from olefins with high selectivity was achieved over heterogeneous bifunctional catalysts via tandem hydroformylation-acetalization.

中文翻译：

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使用多相负载催化剂通过串联加氢甲酰化-缩醛化烯烃一锅法合成缩醛

开发了使用负载型 Rh 基催化剂通过烯烃的串联加氢甲酰化-缩醛化一锅法合成缩醛的绿色路线。实验结果表明，适当的反应温度（120°C）和反应时间（8 h）下合适的 Rh 负载量（1 wt%）有利于缩醛的形成，并且实现了 94.6% 的高缩醛选择性。更重要的是，这种串联催化提高了对有价值的线性产物的选择性。基于催化机理研究，高度分散的 RhOx 纳米粒子和载体上丰富的酸位分别负责加氢甲酰化和缩醛化。通过串联加氢甲酰化-缩醛化，在多相双功能催化剂上实现了直接从烯烃以高选择性一锅法合成缩醛。