Figliolia, Rosario published the artcileCNN pincer ruthenium complexes for efficient transfer hydrogenation of biomass-derived carbonyl compounds, Synthetic Route of 539-88-8, the main research area is ruthenium pincer CNN aryl pyridinemethanamine phosphine carbonyl complex preparation; transfer hydrogenation catalyst ketone aldehyde pincer CNN pyridinemethanamine complex; alc preparation transfer hydrogenation cellulose lignin derived aldehyde ketone.
The ligand HCNNOMe [6-(4-methoxyphenyl)-2-pyridinemethanamine, H2NCH2pyC6H4OMe, py = 2,6-pyridinediyl] is easily prepared by Pd/C-catalyzed reductive amination of the com. available 6-(4-methoxyphenyl)-2-pyridinecarboxaldehyde (H2, 1 atm). The pincer complexes cis-[RuCl(H2NCH2pyC6H3OMe)(PPh3)2] (1) and [RuCl(H2NCH2pyC6H3OMe)(PP)] (2, PP = dppb; 3, PP = dppf) are synthesized from [RuCl2(PPh3)3], H2NCH2pyC6H4OMe and dppb or dppf in 2-propanol with NEt3 at reflux and are isolated in 85-93% yield. Carbonylation of 1 (CO, 1 atm) gives [RuCl(H2NCH2pyC6H3OMe)(CO)(PPh3)] (4) (79% yield) which cleanly reacts with Na[BArf4] and PCy3, affording the cationic trans-[Ru(H2NCH2pyC6H3OMe)(CO)(PCy3)(PPh3)][BArF4] (5) (92% yield). These robust pincer complexes display remarkably high catalytic activity in the transfer hydrogenation (TH) of lignocellulosic biomass carbonyl compounds, using 2-propanol at reflux in a basic medium (NaOiPr or K2CO3). Thus, furfural, 5-(hydroxymethyl)furfural and cyrene are reduced to the corresponding alcs. with 2 and 3, at S/C in the range of 10 000-100 000, within minutes or hours (TOF up to 1 500 000 h-1). The monocarbonyl complex 5 was found to be extremely active in the TH of cinnamaldehyde, vanillin derivatives and Et levulinate at S/C in the range of 10 000-50 000. Vanillyl alc. is also obtained by the TH of vanillin with 5 (S/C = 500) in 2-propanol in the presence of K2CO3.
Dalton Transactions published new progress about Alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics