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Ruthenium p-cymene complexes with α-diimine ligands as catalytic precursors for the transfer hydrogenation of ethyl levulinate to γ-valerolactone
- Source :
- New Journal of Chemistry. 42:17574-17586
- Publication Year :
- 2018
- Publisher :
- Royal Society of Chemistry (RSC), 2018.
-
Abstract
- The ruthenium compounds [(η6-p-cymene)RuCl{κ2N-(HCNR)2}]NO3 (R = 4-C6H4Me, [1]NO3; 4-C6H4OH, [2]NO3; C6H11Cy, [3]NO3; 4-C6H10OH, [4]NO3; tBu, [5]NO3) were prepared in high yields from [(p-cymene)RuCl2]2, AgNO3 and the appropriate α-diimine. Compounds [2]PF6 and [4]PF6 were obtained by a straightforward reaction of [(η6-p-cymene)RuCl(MeCN)0.66]PF6, [6]PF6, with α-diimine, whereas [4]BPh4 was obtained by metathesis between [4]NO3 and NaBPh4. All the ruthenium products were characterized by analytical methods, IR, NMR and UV-Vis spectroscopy; in addition, the structure of [1]NO3 was ascertained by an X-ray diffraction study. Compounds [1–4]NO3, [4]PF6 and [4]BPh4 were investigated as catalytic precursors in the transfer hydrogenation reaction of ethyl levulinate to γ-valerolactone in isopropanol solution under microwave irradiation. [4]BPh4 was revealed to be the best catalytic precursor, affording γ-valerolactone in 62% yield under optimized experimental conditions.
- Subjects :
- p-Cymene
010405 organic chemistry
chemistry.chemical_element
General Chemistry
010402 general chemistry
Transfer hydrogenation
Metathesis
01 natural sciences
Medicinal chemistry
Ruthenium
Catalysis
Catalysi
0104 chemical sciences
Coordination Chemistry
chemistry.chemical_compound
chemistry
Yield (chemistry)
Hydrogen Transfer
Materials Chemistry
Spectroscopy
Diimine
Subjects
Details
- ISSN :
- 13699261 and 11440546
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- New Journal of Chemistry
- Accession number :
- edsair.doi.dedup.....fd17b31b9ea413100bccc00ded1e8881