3 research outputs found
Synthesis of Adipic Aldehyde by <i>n</i>‑Selective Hydroformylation of 4‑Pentenal
No full textSeveral phosphine and phosphite ligands
were tested in the hydroformylation
of 4-pentenal to adipic aldehyde, a versatile starting material for
industrially very relevant compounds. By varying the ligand structure
we were able to increase the selectivity toward adipic aldehyde to
>95%. Additionally, two molecular structures of important catalytic
intermediates [(bisphosphite)ÂRhHÂ(CO)<sub>2</sub>] and one structure
of a previously unknown catalyst decomposition product were obtained
Synthesis of Adipic Acid, 1,6-Hexanediamine, and 1,6-Hexanediol via Double‑<i>n</i>‑Selective Hydroformylation of 1,3-Butadiene
No full textA method for the synthesis of the
industrially relevant monomers
adipic acid, 1,6-hexanediol (HDO), and 1,6-hexanediamine (HMD) via
isomerizing hydroformylation of 1,3-butadiene is described. The aldehyde
intermediates are protected in situ as acetals to avoid hydrogenation
to pentanal. Adipic aldehyde diacetal is obtained in good yields,
and the first examples for the conversion toward adipic acid, 1,6-hexanediol,
and 1,6-hexanediamine are shown
Platinum Group Metal Phosphides as Heterogeneous Catalysts for the Gas-Phase Hydroformylation of Small Olefins
No full textA method
for the synthesis of highly crystalline Rh<sub>2</sub>P nanoparticles
on SiO<sub>2</sub> support materials and their use
as truly heterogeneous single-site catalysts for the hydroformylation
of ethylene and propylene is presented. The supported Rh<sub>2</sub>P nanoparticles were investigated by transmission electron microscopy
and by infrared analysis of adsorbed CO. The influence of feed gas
composition and reaction temperature on the activity and selectivity
in the hydroformylation reaction was evaluated by using high throughput
experimentation as an enabling element; core findings were that beneficial
effects on the selectivity were observed at high CO partial pressures
and after addition of water to the feed gas. The analytical and performance
data of the materials gave evidence that high temperature reduction
leading to highly crystalline Rh<sub>2</sub>P nanoparticles is key
to achieving active, selective, and long-term stable catalysts
