Selective Hydrogenation of Aldehydes Using a Well‐Defined Fe(II) PNP Pincer Complex in Biphasic Medium

Abstract

A biphasic process for the hydrogenation of aldehydes was developed using a well‐defined iron (II) PNP pincer complex as model system to investigate the performance of various ionic liquids. A number of suitable hydrophobic ionic liquids based on the N(Tf)2 − anion were identified, allowing to immobilize the iron (II) catalyst in the ionic liquid layer and to facilitate the separation of the desired alcohols. Further studies showed that targeted Brønsted basic ionic liquids can eliminate the need of an external base to activate the catalyst.

Reduction of carbonyl compounds via hydrosilylation catalyzed by well-defined PNP-Mn(I) hydride complexes

“…The combined organic phases were filtrated over a pad of silica, dried over Na 2 SO 4 and the solvent was removed. Spectroscopic data of all isolated products are in line with the literature [11,[42][43][44][45][46][47][48][49].…”

Homogeneous Catalyzed Valorization of Furanics: A Sustainable Bridge to Fuels and Chemicals

“…Kirchner studied the sam reductive process with Fe-PNP (0.05 mol%) and DBU (1 mol%) at 40 °C, 30 bar H2, and 1 h. The combination of this catalyst with a supported ionic liquid phase (SILP) promote the hydrogenation of aldehydes. Kirchner, Hoffmann, and Bica reported the catalytic ac tivity of this system for the reduction of FAL to FA in a mixture of IL/n-heptane in 87-98% yield under 10-50 bar H2 at 25 °C in 1 h [124][125][126].…”

Structural analysis of mono-substituted N-butyl-pyridinium salts: in search of ionic liquids

“…However, structurallycharacterized examples from this family of salts are surprisingly underreported. The Cambridge Structural Database (CSD) [28] contains just 9 crystal structures of metalfree N-butylpyridinium salts [29][30][31][32][33][34][35] and only 3 where the pyridinium ring is further functionalized: [b4mpy][PCl 6 ] [36], 2-methyl-N-butylpyridinium bromide ([b2mpy]Br) [37], and a chloroform solvate of 4-(dimethylamino)-N-butylpyridinium chloride ([b4dmapy]ClÁCHCl 3 ) [38]. Here we present the crystal structures of four crystalline Nbutylpyridinium salts varying in substitution about the ring and in the identity of the counterion.…”