A brief historic overview of Pt/Sn-catalyzed hydroformylation as well as recent advances in the hydroformylation of internal alkenes is provided. This serves as background for the results obtained with the [Pt(Sixantphos)Cl2] system, for which the molecular structure and the spectroscopic data are described. Insitu UV/Vis-spectroscopic studies have revealed rapid formation of the corresponding Pt–stannate complex upon reaction with SnCl2, whereas high-pressure insitu IR-spectroscopy showed formation of a Pt–CO species and a short-lived Pt–H species under syngas, as well as rapid evolution of aldehyde product upon addition of 1-octene to the preformed catalyst in the IR autoclave. The hydroformylation of 1-octene and the i-octenes has been performed. For the internal alkenes, selective tandem isomerization/hydroformylation towards n-nonanal is observed with this catalyst system.
本文简要概述了
铂/
锰催化加氢甲酰化的历史以及内烯加氢甲酰化的最新进展。这为[Pt(Sixantphos)Cl2]体系所取得的成果提供了背景资料,并介绍了该体系的分子结构和光谱数据。原位紫外/可见光谱研究显示,在与
氯化锡反应时,相应的
铂-
锡酸络合物迅速形成,而高压原位红外光谱显示,在合成气中形成了
铂-CO 物种和短暂的
铂-H 物种,在红外高压釜中将 1-
辛烯加入预成型催化剂时,醛产物迅速演化。对 1-
辛烯和 i-
辛烯进行了加氢甲酰化反应。对于内部的烯烃,在该催化剂体系中可观察到向正
壬醛的选择性串联异构化/氢甲酰化反应。